Intimate partner violence (IPV) and termination of pregnancy (TOP) are global health concerns, but their interaction is undetermined. The aim of this study was to determine whether there is an association between IPV and TOP.
Methods and Findings
A systematic review based on a search of Medline, Embase, PsycINFO, and Ovid Maternity and Infant Care from each database's inception to 21 September 2013 for peer-reviewed articles of any design and language found 74 studies regarding women who had undergone TOP and had experienced at least one domain (physical, sexual, or emotional) of IPV. Prevalence of IPV and association between IPV and TOP were meta-analysed. Sample sizes ranged from eight to 33,385 participants. Worldwide, rates of IPV in the preceding year in women undergoing TOP ranged from 2.5% to 30%. Lifetime prevalence by meta-analysis was shown to be 24.9% (95% CI 19.9% to 30.6%); heterogeneity was high (I2>90%), and variation was not explained by study design, quality, or size, or country gross national income per capita. IPV, including history of rape, sexual assault, contraceptive sabotage, and coerced decision-making, was associated with TOP, and with repeat TOPs. By meta-analysis, partner not knowing about the TOP was shown to be significantly associated with IPV (pooled odds ratio 2.97, 95% CI 2.39 to 3.69). Women in violent relationships were more likely to have concealed the TOP from their partner than those who were not. Demographic factors including age, ethnicity, education, marital status, income, employment, and drug and alcohol use showed no strong or consistent mediating effect. Few long-term outcomes were studied. Women welcomed the opportunity to disclose IPV and be offered help. Limitations include study heterogeneity, potential underreporting of both IPV and TOP in primary data sources, and inherent difficulties in validation.
Intimate partner violence (sometimes referred to as domestic violence) is one of the commonest forms of violence against women and is a global health problem. The World Health Organization defines intimate partner violence as any act of physical, psychological, or sexual aggression or any controlling behavior (for example, restriction of access to assistance) perpetrated by the woman's current or past intimate partner. Although men also experience it, intimate partner violence is overwhelmingly experienced by women, particularly when repeated or severe. Studies indicate that the prevalence (the percentage of a population affected by a condition) of intimate partner violence varies widely within and between countries: the prevalence of intimate partner violence among women ranges from 15% in Japan to 71% in Ethiopia, and the lifetime prevalence of rape (forced sex) within intimate relationships ranges from 5.9% to 42% across the world, for example. Overall, a third of women experience intimate partner violence at some time during their lifetimes. The health consequences of such violence include physical injury, depression, suicidal behavior, and gastrointestinal disorders.
Why Was This Study Done?
Intimate partner violence can also lead to gynecological disorders (conditions affecting the female reproductive organs), unwanted pregnancy, premature labour and birth, and sexually transmitted infections. Because violence may begin or intensify during pregnancy, some countries recommend routine questioning about intimate partner violence during antenatal care. However, women seeking termination of pregnancy (induced abortion) are not routinely asked about intimate partner violence. Every year, many women worldwide terminate a pregnancy. Nearly half of these terminations are unsafe, and complications arising from unsafe abortions are responsible for more than 10% of maternal deaths (deaths from pregnancy or childbirth-related complications). It is important to know whether intimate partner violence and termination of pregnancy are associated in order to develop effective strategies to deal with both these global health concerns. Here, the researchers conducted a systematic review and meta-analysis to investigate the associations between intimate partner violence and termination or pregnancy. A systematic review identifies all the research on a given topic using predefined criteria; meta-analysis combines the results of several studies.
What Did the Researchers Do and Find?
The researchers identified 74 studies that provided information about experiences of intimate partner violence among women who had had a termination of pregnancy. Data in these studies indicated that, worldwide, intimate partner violence rates among women undergoing termination ranged from 2.5% to 30% in the preceding year and from 14% to 40% over their lifetime. In the meta-analysis, the lifetime prevalence of intimate partner violence was 24.9% among termination-seeking populations. The identified studies provided evidence that intimate partner violence was associated with termination and with repeat termination. In one study, for example, women presenting for a third termination were more than two and a half times more likely to have a history of physical or sexual violence than women presenting for their first termination. Moreover, according to the meta-analysis, women in violent relationships were three times as likely to conceal a termination from their partner as women in non-violent relationships. Finally, the studies indicated that women undergoing terminations of pregnancy welcomed the opportunity to disclose their experiences of intimate partner violence and to be offered help.
What Do These Findings Mean?
These findings indicate that intimate partner violence is associated with termination of pregnancy and that a woman's partner not knowing about the termination is a risk factor for intimate partner violence among women seeking termination. Overall, the researchers' findings support the concept that violence can lead to pregnancy and to subsequent termination of pregnancy, and that there may be a repetitive cycle of abuse and pregnancy. The accuracy of these findings is limited by heterogeneity (variability) among the included studies, by the likelihood of underreporting of both intimate partner violence and termination in the included studies, and by lack of validation of reports of violence through, for example, police reports. Nevertheless, health-care professionals should consider the possibility that women seeking termination of pregnancy may be experiencing intimate partner violence. In trying to prevent repeat terminations, health-care professionals should be aware that while focusing on preventing conception may reduce the chances of a woman becoming pregnant, she may still be vulnerable to abuse. Finally, given the clear associations between intimate partner violence and termination of pregnancy, the researchers suggest that termination services represent an appropriate setting in which to test interventions designed to reduce intimate partner violence.
Please access these websites via the online version of this summary at http://dx.doi.org/10.1371/journal.pmed.1001581.
- The World Health organization provides detailed information about intimate partner violence and about termination of pregnancy (some information available in several languages)
- MedlinePlus provides links to other resources about intimate partner violence and about termination of pregnancy (in English and Spanish)
- The World Bank has a webpage that discusses the role of the health sector in preventing gender-based violence and a webpage with links to other resources about gender-based violence
- The Gender and Health Research Unit of the South African Medical Research Council provides links to further resources about intimate partner violence (research briefs/policy briefs/fact sheets/research reports)
- DIVERHSE (Domestic & Interpersonal Violence: Effecting Responses in the Health Sector in Europe) is a European forum for health professionals, nongovernmental organizations, policy-makers, and academics to share their expertise and good practice in developing and evaluating interventions to address violence against women and children in a variety of health-care settings
- London School of Hygiene & Tropical Medicine's Gender Violence and Health Centre also has a number of research resources
- The UK National Health Service Choices website provides personal stories of intimate partner violence during pregnancy
- The March of Dimes provides information on identifying intimate partner violence during pregnancy and making a safety plan
Citation: Hall M, Chappell LC, Parnell BL, Seed PT, Bewley S (2014) Associations between Intimate Partner Violence and Termination of Pregnancy: A Systematic Review and Meta-Analysis. PLoS Med 11(1): e1001581. https://doi.org/10.1371/journal.pmed.1001581
Academic Editor: Edward J. Mills, University of Ottawa, Canada
Received: August 27, 2013; Accepted: November 20, 2013; Published: January 7, 2014
Copyright: © 2014 Hall et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Funding: There was no funding associated with this work.
Competing interests: SB has received charitable grant funding to study violence in pregnancy (Economic and Social Research Council, Guys & St Thomas' Charitable Foundation, Friends of Guys Charity) and received a fee (£900) for expert obstetric advisory work from Marie Stopes International. LCC is a Freelance Associate Editor for PLOS Medicine. MH, BLP, and PTS declare no competing interests.
Abbreviations: CASP, Critical Appraisal Skills Programme; GNI, gross national income; IPV, intimate partner violence; OR, odds ratio; TOP, termination of pregnancy; WHO, World Health Organization
Intimate partner violence (IPV) has been defined by the World Health Organization (WHO) as “behaviour within an intimate relationship that causes physical, sexual or psychological harm, including acts of physical aggression, sexual coercion, psychological abuse and controlling behaviours” encompassing both current and past intimate partners . Estimated prevalence varies globally and within countries, and is partly dependent on definition and methodology; lifetime exposure has been found to range from 15% in Japan to 71% in Ethiopia (estimated by WHO multi-country studies), has been estimated at 24% in the UK based on UK Home Office crime statistics , and has been estimated to be around 35% (inclusive of stalking) in the US . Rape within intimate relationships has been reported to be common across a number of continents, with lifetime prevalence of forced sex ranging from 5.9% to 42% .
Health consequences of IPV are known to include, but not be limited to, increased physical injuries and gastrointestinal, gynaecological, and psychiatric co-morbidities –. Violence may begin or intensify during pregnancy and is associated with adverse obstetric outcomes  and maternal death ,. Increased homicide ,, and suicide are found among individuals experiencing IPV ,.
Randomised trial evidence has shown that training primary care professionals in selective questioning of women about IPV increases disclosure and referral to specialist IPV services . Antenatal routine questioning for IPV is recommended in both the US and UK ,, despite uncertainty over the harms and benefits of universal questioning and subsequent intervention . Ongoing pregnancy is considered to be a time of increased risk of IPV, yet women seeking termination of pregnancy (TOP) are not such a focus of attention . An evidence-based understanding of the association between IPV and TOP would directly inform the development of strategies for effective interventions for IPV. To our knowledge there has been no previous systematic review of the literature.
The aim of this study was to determine whether there is an association between IPV and TOP.
Studies were considered eligible for inclusion if they (1) included women who were seeking or had undergone a TOP and studied at least one aspect of IPV in this group; (2) were a randomised control trial, case-control study, cohort study, cross-sectional analysis, experimental study, or secondary study with data of interest; and (3) were peer reviewed. Studies focusing on violence by individuals other than current or former intimate partners were excluded. No restrictions were placed on the setting, time, or language of the studies. Quantitative data were not necessary for inclusion.
The population of interest was women seeking or having undergone a TOP in any setting; the exposure was the presence or absence of IPV; the control group, where reported, was a separate cohort of comparable individuals (e.g., pregnant women not seeking TOP, pregnant women not reporting IPV, or women attending a gynaecology clinic); the statistic of interest was the association between IPV and TOP. We included articles where the relative timing of IPV and TOP could not be delineated. The search strategy was devised using a combination of Medical Subject Headings (MeSH terms) and free text terms with synonyms (see Table 1). Searches were carried out in Medline (1946–21 September 2013), Embase (1980–21 September 2013), PsycINFO (1806–21 September 2013), and Ovid Maternity and Infant Care (1971–21 September 2013) from the earliest possible date until 21 September 2013. In addition, a search of Web of Science and hand searches of reference lists of all included articles were carried out. Nine authors were contacted regarding results, and they identified further articles. There was no restriction on language. If multiple articles based on the same study were identified, duplication was avoided by only using the data reported for different sub-groups.
All titles were independently screened by two authors (M. H. and S. B.). If either considered a title relevant, both reviewers independently screened the abstract. All articles were included for full-text assessment if either author considered the abstract relevant or there was uncertainty. Full-text assessment to determine inclusion was independently carried out by two authors (M. H. and S. B.). Any disagreements were discussed, and any study whose inclusion remained ambivalent was referred to a third author (L. C. C.).
A standard form was devised (see Table S1) prior to data extraction and quality scoring. Data were extracted on study type; population; setting, country, and region; demographic and health factors; intervention; comparator population; definition of IPV; screening tools used; and incidence and prevalence of IPV among general populations and in relation to TOP. Data from the articles were independently extracted by two authors (M. H. and B. L. P.). Results addressing violence by individuals other than current or previous intimate partners were excluded. Any uncertainties were discussed, and referred to a third author (L. C. C.) if necessary. Data extraction and quality scoring of articles published in languages other than English (n = 3) were undertaken by one author (M. H.) and the translator.
Quality appraisal of quantitative and qualitative studies was carried out using Critical Appraisal Skills Programme (CASP) scales  as modified by Oram and colleagues  (see Tables S2 and S3), consisting of 15 and ten criteria, respectively, each of which could be scored between zero and two (maximum scores 30 and 20). Two authors (M. H. and B. L. P.) carried out full quality appraisal of all articles. Any disagreements were discussed, and referred to a third author (L. C. C.) if necessary. Quantitative CASP scores of ≥25, ≥20, ≥15, and ≤14 and qualitative CASP scores of ≥17, ≥14, ≥12, and ≤11 were considered high, medium, low, and very low quality, respectively.
Meta-Analysis and Regression
The prevalences of IPV (as percentages) were converted to log odds prior to combining using the DerSimonian and Laird random effects method of meta-analysis . Resulting estimates and confidence intervals were reconverted to percentages prior to display. Forest plots show actual percentages on the log-odds scale and are displayed sub-grouped by gross national income (GNI) per capita, as previous reports (e.g., from WHO) have chosen similar economic groupings . Comparisons between groups used odds ratios (ORs). Estimated heterogeneity (I2) is displayed for all group and sub-group analyses. We investigated the possibility of a sub-group of recent or high-quality studies with consistent methods and consistent results that could be used to give generally applicable results.
Meta-analysis regression is a meta-analysis technique developed specifically to explain large and unexplained differences in results between studies (also known as heterogeneity). The method used assumes that the differences are in part random and in part explainable .
Potential sources of heterogeneity were investigated using meta-analysis regression: country's GNI per capita (in intervals of INT$10,000), study quality (measured by CASP score), date of study (decade), study design (cross-sectional, cohort, or case-control), setting (urban versus regional versus national), and study size (total number of participants as a continuous variable). Egger's test was performed in order to assess potential publication bias .
Study Selection Process
The study selection process is shown in Figure 1. Of a total of 438 articles identified for screening after removal of duplicates, 104 were considered eligible for full-text screening, and 74 were included in the review –. Tables 2–9 detail the studies, grouped into tables by design—and additionally by continent for cross-sectional studies—and listed within tables by reverse chronology.
Key Features of Studies
The publication dates of the studies ranged from 1985 to 2013, with the majority (67/74, 91%) having been reported since 2000. Sixty-eight studies included quantitative data, with six being exclusively qualitative. The majority of quantitative studies were cross-sectional (57), with the remaining being cohort (three) and case-control (eight, of which five used a pregnant and three used a non-pregnant comparator group). Geographically, the study locations spanned six continents: North America (35), Asia (12), Europe (10), Africa (8), Australasia (6), and South America (2), with one further study analysing data from several continents. Women were asked about IPV in a variety of settings, including home, gynaecology wards, termination clinics, and other specialist medical clinics, and in various ways, including telephone or written questionnaire and national scale surveys. Among the quantitative studies there were 10 high, 31 medium, 19 low, and eight very low quality reports (mean score 20.2, standard deviation 4.0). Of the qualitative studies two were medium, one low, and three very low quality (mean score 11.5, standard deviation 2.2). The majority of studies analysed exclusively women (69), with few analysing exclusively men (two) or both men and women (three). Sample sizes ranged from eight to 33,385 participants (eight, 30, and 36 studies had <100, 100–999, and ≥1,000 participants, respectively; median number of participants 942, interquartile range 208 to 2,391). The exposures included physical violence (53), sexual violence (47), and emotional violence (19), with many articles looking at combinations (42). Table S5 shows the associations of clinical and demographic factors with IPV in women seeking TOP.
Prevalence and Meta-Analysis of Lifetime Prevalence
Among women who underwent TOP, reported rates of IPV in the preceding year ranged from 2.5%  to 30% , while lifetime rates of IPV in this population varied from 14%  to 40% . Meta-analysis of lifetime prevalence of IPV among TOP-seeking populations was found to be 24.9% (95% CI 19.9% to 30.6%), as shown in Figure 2. Following systematic meta-analysis regression, we found that the high level of variation between studies was not explicable by study quality, type, or size, or country GNI per capita (Table S6). The association between IPV and TOP is shown in Figure 3; variation is not explained by GNI per capita. I2 values for heterogeneity were high, as expected when pooling data with proportions.
Weights are from random effects analysis. D+L, combined effects using the DerSimonian and Laird  random effects method; I-V, combined effects using the inverse variance fixed effects method.
Weights are from random effects analysis. D+L, combined effects using the DerSimonian and Laird  random effects method; I-V, combined effects using the inverse variance fixed effects method. Countries grouped by GNI (shown in parentheses).
Meta-Analysis of Risk Factors
Meta-analysis was undertaken for four factors where data were available (woman being single versus married, partner not knowing about the TOP, partner support for the TOP, and previous TOP), but was not possible for others, as the definitions of both IPV and the risk factors varied, or there was a lack of numerical data or only a single study in many cases. Figure 4 shows no association (pooled OR 2.97, 95% CI 2.39 to 3.69) between being single and IPV among a TOP-seeking population. There was an association (pooled OR 2.32, 95% CI 2.00 to 2.69) between partner not knowing about the TOP and IPV (Figure 5), but no association between partner support for the TOP and IPV (pooled OR 1.37, 95% CI 0.82 to 2.30) (Figure 6). Meta-analysis of three studies reporting on the association between IPV and previous TOP showed no significant association (pooled OR 1.42, 95% CI 0.85 to 2.36) (Figure 7), but five of six further studies reported individual significant associations, though with inadequate quantitative data to include in the meta-analysis. Table S5 shows the associations of clinical and demographic factors with IPV in women seeking TOP.
Weights are from random effects analysis. OR, odds ratio.
Weights are from random effects analysis. OR, odds ratio.
Weights are from random effects analysis. OR, odds ratio.
Associations with Reproductive and Pregnancy Factors
Past obstetric history.
Nine studies showed that women who reported IPV were more likely than the comparator group to have a history of multiple TOPs (Tables 3–5) ,,,,,,,,. The highest quality study found that women presenting for a third TOP were over two and half times more likely to have a history of physical or sexual violence than women presenting for their first . There was no significant association between number of pregnancies and IPV (gravidity in group of women reporting IPV: mean 3.2, standard deviation 2.0; among women not reporting IPV: mean 3.0, standard deviation 2.0) , although one medium quality study found a higher odds of history of previous miscarriage among women reporting IPV at a termination clinic, as compared to those not reporting IPV (OR 1.6, 95% CI 1.1–2.2) .
Coercion, contraception, and conception.
One study investigating pregnancy intention found that women in violent relationships were more likely to say that the pregnancy “had been imposed” upon them by their partner (13% versus 2% for women not in physically or sexually violent relationship) . A further two studies found that pregnancy associated with sexual coercion and ending in TOP was also 1.8- to 3.8-fold more likely to be associated with IPV ,. One study found that women in violent relationships were significantly more likely to report going without contraceptives compared to women not reporting IPV (Table 3) , with another study finding that they were more likely to use them (Table 4) . In four studies, of which two were very low quality, women reported being actively prevented from obtaining contraception by their partner, or that their partner was refusing or deceiving them about birth control use (Tables 3 and 4) ,,,. It was reported that a partner preventing access to contraception led to concealed use of contraceptives among some women .
One cross-sectional population telephone survey of over 4,000 women found that over 46% of 616 “completed rapes” were perpetrated by a husband or boyfriend, and that 50% of 20 rape-related pregnancies ended in TOP . One low quality study of women who migrated as adults from the Indian subcontinent to the US and had a history of seeking sex selection services found that a third of 65 women described past physical abuse and neglect related specifically to not producing a male child .
Factors Relating to Termination of Pregnancy
Women reporting IPV were more likely to report an unwanted pregnancy (7.4% of 163 women not reporting IPV versus 23.3% of 44 women reporting IPV) . Additionally, a high quality study, though with small numbers, found that women attending a termination clinic with a planned pregnancy were more likely to report IPV (50% of 12 women) than those who did not plan their pregnancy (5.6% of 337 women) . There was evidence from very low quality studies that some women felt coerced by their violent partner into having a TOP (Table 4) ,. One medium quality study found that 2% of 1,215 women in a termination clinic reported being forced into the decision by their partner . One small, very low quality study of 38 women participating in a hospital-based IPV programme found that 18% reported feeling “pressured” into TOP and 5% were forced into undergoing the procedure .
There was consistent evidence that women in violent relationships were more likely not to tell their partner about their decision to terminate (pooled OR 2.97, 95% CI 2.39 to 3.69; Figure 5) ,,. Women with an IPV history were less likely to have their partner fund their TOP (27% of 25 women reporting IPV had their partner pay for their TOP versus 63% of 155 women not reporting IPV) .
Gestation and method of termination of pregnancy.
Two studies, one of high and one of low quality, failed to find any association between IPV and gestation at TOP ,, although one lower quality study reported that women having a second trimester TOP were more likely to report a history of forced sex than women having a first trimester TOP (35.3% of 410 versus 11.5% of 139), , and another found that women later in their second trimester (over 16 versus 13–15 weeks' gestation) at time of TOP were more likely to report IPV (OR 1.23, 95% CI 0.79 to 1.91) . One further study found that women who reported IPV were more likely to have the gestational age of the fetus redated on ultrasound (64.9% of 243 women reporting IPV versus 49.9% of 817 women not reporting IPV) .
In women who had undergone TOP, there was a significant association between reported IPV and psychosocial problems including depression ,, suicidal ideation , stress ,, and disturbing thoughts , although the temporal relationships were unclear (Table 4) ,. No studies identified the subsequent impact of IPV and TOP on the woman, her partner, or their relationship.
Disclosure and intervention.
Five studies examined disclosure in termination clinics: IPV questionnaires were highly acceptable , although non-responding women differed from those who responded and had undergone more TOPs . Women in violent relationships were as likely to attend for follow-up (52.2% of 413 non-abused women defaulted versus 46.6% of 88 abused women)  and more likely to know about community resources for IPV (80% of 16 women reporting IPV versus 67% of 35 women not reporting IPV) . Some women reported events that would meet the definition of IPV but did not identify themselves as experiencing IPV . Nevertheless, many women wished to talk about IPV with regard to further management or intervention , with some citing their doctor as the main source of information . However, during a period of universal screening only 51% of 499 women were asked about IPV; certain sub-groups of women were more likely to be asked about IPV (e.g., white women, in a Canadian study, in which white women made up 55% of the TOP-seeking population [n = 499], but 63% of those asked about IPV [n = 254] ).
The majority of studies focused on female factors. The results relating to impact of age on the association between IPV and TOP were discrepant, and interpretation is hindered by different age groups being used. One paper reported that past year incidence of IPV was higher among women under the age of 20 y seeking TOP (50.0%) than among those 20 y or over (26.9%); however, the converse , or no significant association (Tables 4, 6, and 7) ,,, has also been reported.
There was contradictory evidence for variance between women of different race or ethnicity, with two studies finding converse associations; one found that significantly fewer white Caucasian women (12% of 160 women) reported IPV as compared to non-white women (21% of 94 women, p = 0.003) ; another study of women seeking elective pregnancy termination reported that a greater proportion of white women (48% of 226) had experienced IPV compared to black women (31% of 223, p = 0.001) . This finding may not be generalisable to other locations. No significant associations were found with women's level of education in two studies , or with women's income . Three studies reported no significant association with employment status ,,, whilst two suggested that unemployed women or non-skilled labourers were more likely to report both IPV and TOP (25.3% of 291 women seeking TOP and reporting IPV were unemployed versus 19.1% of 1,096 women seeking TOP and not reporting IPV) ,.
Three studies of similar medium quality assessed drug and alcohol use; one study found that, compared to women not reporting IPV, women in a termination clinic who reported IPV were also more likely to smoke (25.6% of 117 women experiencing IPV versus 11.0% of 1,497 non-abused women) and drink (12.8% of women experiencing IPV versus 4.9% of non-abused women) , but other studies found no significant association  or reported an association only anecdotally .
Five studies, one of high and four of medium quality, found that, compared to married women, those who were single, separated, divorced, or widowed were more likely to have a history of IPV and TOP (Tables 3, 4, and 7) ,,,,, though one medium quality study found no significant association , and one further study of women experiencing IPV found married women were more likely to report a TOP (89% of 23,909 married women compared to 11% of 9,408 unmarried women) . Women who reported difficulties in their relationship were also more likely to report IPV when asked at a termination clinic in all studies (with one study finding that 7.7% of 350 women undergoing a TOP reported difficulties in their relationship, as opposed to 1.8% of 653 women continuing pregnancy) ,,. One study found no significant association between prevalence of IPV and household income (27.2% of 669 women reporting TOP were in the lowest income bracket, as compared to 26.5% of 139 women not reporting TOP) .
One article studied men attending community health centres and identified that men who admitted to IPV perpetration were more likely to report having “been involved in a pregnancy” that ended in TOP (48.9% of 188 men reporting IPV perpetration also reported involvement in TOP, as opposed to 22.7% of 402 men not reporting IPV perpetration) . Another study of partners of women having a first or subsequent TOP found higher rates of IPV experienced by the men involved in a second or more TOP (12% of 188 men whose partner was having a second or subsequent TOP reported “being a victim” of IPV versus 6% of men whose partner was having a first TOP) . One low quality study noted that 36% of 16 women reporting IPV stated that their perpetrating partner had been the victim of abuse as a child .
For IPV in women presenting for TOP, there was no evidence of bias relating to non-publication of small non-significant studies; Egger's test  for small-study effects was non-significant (p = 0.13). These associations, the uncertainties, and gaps in knowledge are shown diagrammatically in Figure 8.
Key to associations: red, associations meta-analysed; amber, associations not meta-analysed but shown in literature; green, no significant association described in the literature; grey, not studied.
There were no intervention studies.
Summary of Main Findings
The literature is extensive, but variable in quality, and largely focused on female factors. High rates of physical, sexual, and emotional IPV were found across six continents among women seeking a TOP. According to meta-analysis, partner not knowing about the TOP was associated with IPV among women seeking TOP. However, lack of partner support for TOP is not associated with IPV among women seeking TOP. The literature also suggests that women in abusive relationships were more likely to report inability to make autonomous contraceptive choices, partner contraceptive sabotage, and sexual violence, and they were less likely to have informed their partner about the pregnancy or involved him in decision-making about it. IPV was cited as a reason for wanting TOP, and rape-related pregnancy had a particularly high chance of leading to TOP. The meta-analysis did not find that multiple TOPs were associated with IPV, but its credibility is undermined by both the number of studies that did (albeit unquantified) and the association reported by men who stated they had been perpetrators of IPV. Although it was not always determined whether experiencing IPV was a determining factor in the decision to end, rather than continue, a pregnancy, the findings support the concept that violence can sometimes lead to an initial pregnancy (via coercion, rape, sexual assault, or contraceptive sabotage) and to a subsequent TOP (via coercion). There was a lack of data regarding long-term outcomes for women in violent relationships who underwent TOP, but associations with repeat TOP (and possibly miscarriage) lend support to the notion of a repetitive cycle of abuse and pregnancy. Not informing the male partner may then be explicable as a reason to avoid partner involvement or further abuse.
Strengths and Limitations
Strengths of the review and meta-analysis include use of multiple databases, no language restriction, hand searching of reference lists, double data entry, and quality assessment of both quantitative and qualitative studies from a wide variety of settings, thus improving reliability and generalisability. Limitations include unexplained large differences in both prevalences and odds ratios between studies (heterogeneity), likelihood of underreporting of both IPV  and TOP (particularly when both are stigmatised) in the primary data sources, and inherent difficulties in validation. There is potential publication bias towards research showing a positive relationship. The meta-analysis may be biased, as only those studies quantitatively reporting a significant result could be included, whilst those stating an association (without providing data for inclusion) had to be excluded. It was not possible to determine the legality of, or access to, TOP for each country or state at the specific time point of study; thus, the analysis has not included evaluation of such barriers. It was not possible to determine temporal relationships and patterns of abuse, pregnancy, and TOP.
Comparison with Other Studies
Only one review has previously examined the association between IPV and TOP within a study of broader sexual health issues , concluding that TOP and repeat TOP were associated with IPV, but without reporting on other associations. The review was single-authored, lacked systematic analysis, and included only eight studies. Other relevant systematic reviews and observational studies on IPV have included women with ongoing pregnancies, women with pregnancy loss, or all women of reproductive age, noting poorer mental, physical, and pregnancy outcomes for the women experiencing IPV –. One review found an association between presence of depressive or anxiety disorders in women and increased likelihood of IPV compared to women without mental disorders, but the direction of causality could not be determined, as few studies were longitudinal . IPV was also associated with physical injury: presentation to hospital accident and emergency departments with unwitnessed head, neck, or facial injuries was a significant marker for IPV . A large observational study conducted by WHO found that women who reported a history of partner violence were more likely to report physical and mental health problems including emotional distress and suicidal thoughts, as well as difficulties with activities of daily living . Comparison groups that might prove useful would be women with ongoing but unplanned pregnancy (no specific studies available) and women with ongoing wanted pregnancy. In ongoing pregnancies, IPV was associated with 1.5-fold increased risks of low birth weight and preterm birth . A large observational study has reported poorer maternal outcomes, including hypertension, renal and urinary tract infection, and vaginal bleeding, with IPV .
Implications and Clinical Relevance
Health-care professionals should be aware of the high rates of physical, sexual, and emotional violence among women seeking TOP, and particularly the clinical factors associated with greatest risk: previous TOP, lack of contraception, initially planned pregnancy, ultrasound redating, and the partner not funding or not being told about the TOP. There are potential associations for IPV with young age, marital status, ethnicity, and low household income. IPV compromises both the safety and health of the woman requesting the TOP, and potentially that of her partner and any existing children if a woman retaliates or children witness or experience the violence directly. In attempting to prevent repeat TOP , a narrow focus, especially on long-acting contraception, that excludes addressing the wider needs of a woman in a violent relationship might leave a woman less likely to become pregnant but just as vulnerable to IPV. Good practice obligates that termination services should have robust policies for ensuring women's safety and confidentiality, providing information and referral pathways for those who disclose IPV, and exemplar guidance exists .
Some groups have evaluated whether screening for IPV is justified in selected populations of women. Theoretically, early identification and effective intervention for violence may reduce repeat unintended pregnancy and TOP, as well as improve longer term health outcomes. Three systematic reviews – have concluded that screening is warranted, leading the US Preventative Task Force to recommend that clinicians should screen women of childbearing age for interpersonal violence, such as IPV, and refer women who screen positive to intervention services . The UK National Institute for Health and Care Excellence is currently undertaking a consultation regarding guidance on identification and prevention of IPV . However, interventions in this area are inherently complex and difficult to research , and evidence for the effectiveness of counselling intervention programmes or other interventions remains limited ,,. Of all approaches evaluated, intensive advocacy (aiming to provide women with information and support to facilitate access to community resources) appears the most promising in reducing physical abuse 1–2 y after the intervention, but impact on quality of life or mental health is not proven . The majority of interventions studied have focused on the female experiencing IPV, but some have undertaken theoretical analysis of models in which changes in the behaviours of the male perpetrators are included . A comparative study of promising health-based IPV interventions in primary care and maternity services across Europe found that key implementation issues of IPV interventions included clinical champions, leadership roles, funded and coordinated multiagency partnerships with clear referral pathways, multidisciplinary and participant feedback, and evaluation of outcomes . Interventions as part of the pathway for women seeking TOP require further consideration.
No study we found set out to examine the association or temporal relationships between IPV and TOP, which would require (at a minimum) including women with and without an IPV history and with and without a history of TOP. There is extremely limited information about male partners of women seeking TOP, as perpetrators or as experiencing IPV, and which male-related factors contribute to increased likelihood of IPV. Greater information is required on long-term outcomes of violence and TOP on both partners. The findings of pregnancy “concealment” and higher rates of murder and suicide with IPV , mean that researchers must be cautious and aware of women's safety. Harms have been identified following health-based IPV interventions, such as breaches of confidentiality . Therefore, a public health approach that does not focus solely on the woman (either as “problem” or “solution”) or health services should be considered, for example, using educational, social norm, and/or criminal justice interventions. Nevertheless, given the clear associations, termination services provide an appropriate setting in which to assess screening for, or give information about, IPV, whether pre- or post-TOP, and for offering an intervention that women desire, such as a “one stop” offer of referral to specialist IPV services, especially in view of low return to clinics for follow-up . Given that routine identification of women experiencing IPV and provision of a standard intervention has recently been shown to have no impact on quality of life or mental well-being, there is now a need for considering new strategies, including alternative intervention models and targeting perpetrators as well as the women affected –. On the basis of this review, research into the suitability, acceptability, and design of an intervention programme is justified, and should be tested preferably in a randomised control trial. Any legal barriers to intervention and reporting, such as criminalisation of TOP, should also be investigated and described.
Lifetime prevalence of intimate partner violence in women presenting for termination of pregnancy: meta-analysis regression to compare odds ratios between study categories.
We thank the librarians at King's College London and the Royal College of Obstetricians and Gynaecologists for their assistance in locating articles, and David Zicho of Leeds Teaching Hospitals General Infirmary and Camilla Schneck and Nayara Cintra of City University London for their assistance in translation.
Conceived and designed the experiments: SB MH PTS LC. Performed the experiments: MH BP LC PTS SB. Analyzed the data: MH BP LC PTS SB. Wrote the first draft of the manuscript: MH LC SB. Contributed to the writing of the manuscript: MH LC BP PTS SB. ICMJE criteria for authorship read and met: MH LC BP PTS SB. Agree with manuscript results and conclusions: MH LC BP PTS SB.
- 1. World Health Organization, London School of Hygiene and Tropical Medicine (2010) Preventing intimate partner and sexual violence against women: taking action and generating evidence. Geneva: World Health Organization. 94 p.
- 2. UK Home Office (2012) Home Office statistical bulletin: homicides, firearm offences and intimate violence 2010/11: supplementary volume 2 to crime in England and Wales 2010/11. Available: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/116483/hosb0212.pdf. Accessed 10 March 2013.
- 3. Black M, Basile K, Breiding M, Smith S, Walters M, et al.. (2010) National Intimate Partner and Sexual Violence Survey: 2010 summary report. Available: http://www.cdc.gov/violenceprevention/pdf/nisvs_report2010-a.pdf. Accessed 10 March 2013.
- 4. Krug EG, Dahlberg LL, Mercy JA, Zwi AB, Lozano R, editors (2002) World report on violence and health. Geneva: World Health Organization. 346 p.
- 5. Campbell JC (2002) Health consequences of intimate partner violence. Lancet 359: 1331–1336.
- 6. Devries KM, Mak JY, Bacchus LJ, Child JC, Falder G, et al. (2013) Intimate partner violence and incident depressive symptoms and suicide attempts: a systematic review of longitudinal studies. PLoS Med 10: e1001439
- 7. Howard LM, Oram S, Galley H, Trevillion K, Feder G (2013) Domestic violence and perinatal mental disorders: a systematic review and meta-analysis. PLoS Med 10: e1001452
- 8. Silverman JG, Decker MR, Reed E, Raj A (2006) Intimate partner violence victimization prior to and during pregnancy among women residing in 26 U.S. states: associations with maternal and neonatal health. Am J Obstet Gynecol 195: 140–148.
- 9. Lewis G, editor (2007) Confidential Enquiry into Maternal and Child Health. Saving mothers' lives: revisiting maternal deaths to make motherhood safer—2003–2005. The seventh report on Confidential Enquiries into Maternal Deaths in the United Kingdom. London: Confidential Enquiry into Maternal and Child Health.
- 10. Cantwell R, Clutton-Brock T, Cooper G, Dawson A, Drife J, et al. (2011) Saving mothers' lives: reviewing maternal deaths to make motherhood safer: 2006–2008. The eighth report of the Confidential Enquiries into Maternal Deaths in the United Kingdom. BJOG 118 (Suppl 1) 1–203.
- 11. Abrahams N, Mathews S, Martin LJ, Lombard C, Jewkes R (2013) Intimate partner femicide in South Africa in 1999 and 2009. PLoS Med 10: e1001412
- 12. Stöckl H, Devries K, Rotstein A, Abrahams N, Campbell J, et al. (2013) The global prevalence of intimate partner homicide: a systematic review. Lancet 382: 859–865.
- 13. Devries K, Watts C, Yoshihama M, Kiss L, Schraiber LB, et al. (2011) Violence against women is strongly associated with suicide attempts: evidence from the WHO multi-country study on women's health and domestic violence against women. Soc Sci Med 73: 79–86.
- 14. Feder G, Davies RA, Baird K, Dunne D, Eldridge S, et al. (2011) Identification and referral to improve safety (IRIS) of women experiencing domestic violence with a primary care training and support programme: a cluster randomised controlled trial. Lancet 378: 1788–1795.
- 15. UK Department of Health (2004 October 20) Health minister announces new steps to aid victims of domestic violence. London: UK Department of Health. Available: https://webarchive.nationalarchives.gov.uk//www.dh.gov.uk/en/Publicationsandstatistics/Pressreleases/DH_4091530. Accessed 18 March 2012.
- 16. ACOG Committee opinion No. 518: intimate partner violence. Obstet Gynecol 119: 412–417.
- 17. Ramsay J, Richardson J, Carter YH, Davidson LL, Feder G (2002) Should health professionals screen women for domestic violence? Systematic review. BMJ 325: 314.
- 18. Aston G, Bewley S (2009) Abortion and domestic violence. Obstetrician Gynaecologist 11: 163–168.
- 19. Critical Appraisal Skills Programme (2013) Appraising the evidence. Available: http://www.casp-uk.net/find-appraise-act/appraising-the-evidence/. Accessed 10 March 2013.
- 20. Oram S, Stockl H, Busza J, Howard LM, Zimmerman C (2012) Prevalence and risk of violence and the physical, mental, and sexual health problems associated with human trafficking: systematic review. PLoS Med 9: e1001224
- 21. DerSimonian R, Laird N (1986) Meta-analysis in clinical trials. Control Clin Trials 7: 177–188.
- 22. Garcia-Moreno C, Jansen HA, Ellsberg M, Heise L, Watts C (2005) WHO multi-country study on women's health and domestic violence against women: initial response on prevalence, health outcomes and women's responses. Geneva: World Health Organization.
- 23. Knapp G, Hartung J (2003) Improved tests for a random effects meta-regression with a single covariate. Stat Med 22: 2693–2710.
- 24. Egger M, Davey Smith G, Schneider M, Minder C (1997) Bias in meta-analysis detected by a simple, graphical test. BMJ 315: 629–634.
- 25. Fergusson DM, Boden JM, Horwood L (2007) Abortion among young women and subsequent life outcomes. Perspect Sex Reprod Health 39: 6–12.
- 26. Taft AJ, Watson LF (2007) Termination of pregnancy: associations with partner violence and other factors in a national cohort of young Australian women. Aust N Z J Public Health 31: 135–142.
- 27. Stenson K, Heimer G, Lundh C, Nordstrom ML, Saarinen H, et al. (2001) The prevalence of violence investigated in a pregnant population in Sweden. J Psychosom Obstet Gynaecol 22: 189–197.
- 28. Gee RE, Mitra N, Wan F, Chavkin DE, Long JA (2009) Power over parity: intimate partner violence and issues of fertility control. Am J Obstet Gynecol 201: 148e1–7.
- 29. Romito P, Escriba-Aguir V, Pomicino L, Lucchetta C, Scrimin F, et al. (2009) Violence in the lives of women in Italy who have an elective abortion. Womens Health Issues 19: 335–343.
- 30. Bourassa D, Berube J (2007) The prevalence of intimate partner violence among women and teenagers seeking abortion compared with those continuing pregnancy. J Obstet Gynaecol Can 29: 415–423.
- 31. Lipsky S, Holt VL, Easterling TR, Critchlow CW (2005) Police-reported intimate partner violence during pregnancy: who is at risk? Violence Vict 20: 69–86.
- 32. Helweg-Larsen K, Kruse M (2003) Violence against women and consequent health problems: a register-based study. Scand J Public Health 31: 51–57.
- 33. Leung TW, Leung WC, Chan PL, Ho PC (2002) A comparison of the prevalence of domestic violence between patients seeking termination of pregnancy and other general gynecology patients. Int J Gynaecol Obstet 77: 47–54.
- 34. Yimin C, Shouqing LI, Arzhu QU, Yuke Z, Jianhua W, et al. (2002) Sexual coercion among adolescent women seeking abortion in China. J Adolesc Health 31: 482–486.
- 35. Yimin C, Baohua K, Tieyan W, Xuejun H, Huan S, et al. (2001) Case-controlled study on relevant factors of adolescent sexual coercion in China. Contraception 64: 77–80.
- 36. Jones RK, Frohwirth L, Moore AM (2013) More than poverty: disruptive events among women having abortions in the USA. J Fam Plann Reprod Health Care 39: 36–43.
- 37. Ely GE, Nugent WR, Cerel J, Vimbba M (2011) The relationship between suicidal thinking and dating violence in a sample of adolescent abortion patients. Crisis 32: 246–253.
- 38. Ely GE, Otis MD (2011) An examination of intimate partner violence and psychological stressors in adult abortion patients. J Interpers Violence 26: 3248–3266.
- 39. Jones RK, Moore AM, Frohwirth LF (2011) Perceptions of male knowledge and support among U.S. women obtaining abortions. Womens Health Issues 21: 117–123.
- 40. Jones R, Finer L (2012) Who has second-trimester abortions in the United States? Contraception 85: 544–551.
- 41. Roth L, Sheeder J, Teal SB (2011) Predictors of intimate partner violence in women seeking medication abortion. Contraception 85: 76–80.
- 42. Steinberg JR, Finer LB (2011) Examining the association of abortion history and current mental health: a reanalysis of the National Comorbidity Survey using a common-risk-factors model. Soc Sci Med 72: 72–82.
- 43. Saftlas AF, Wallis AB, Shochet T, Harland KK, Dickey P, et al. (2010) Prevalence of intimate partner violence among an abortion clinic population. Am J Public Health 100: 1412–1415.
- 44. Silverman JG, Decker MR, McCauley HL, Gupta J, Miller E, et al. (2010) Male perpetration of intimate partner violence and involvement in abortions and abortion-related conflict. Am J Public Health 100: 1415–1417.
- 45. Thiel de Bocanegra H, Rostovtseva DP, Khera S, Godhwani N (2010) Birth control sabotage and forced sex: experiences reported by women in domestic violence shelters. Violence Against Women 16: 601–612.
- 46. Coleman P, Rue V, Coyle C (2009) Induced abortion and intimate relationship quality in the Chicago Health and Social Life Survey. Public Health 123: 331–338.
- 47. Ely GE, Nugent WR, Flaherty C (2009) The relationship between dating violence and psychosocial problems in a sample of adolescent pregnancy termination patients. Violence Vict 24: 577–590.
- 48. Prager SW, Steinauer JE, Foster DG, Darney PD, Drey EA (2007) Risk factors for repeat elective abortion. Am J Obstet Gynecol 197: 575.e1–6.
- 49. Kazi S, Reeves MF, Creinin MD (2008) The prevalence of domestic violence in volunteers for abortion and contraceptive research studies. Contraception 78: 79–83.
- 50. Finer LB, Frohwirth LF, Dauphinee LA, Singh S, Moore AM (2005) Reasons U.S. women have abortions: quantitative and qualitative perspectives. Perspect Sex Reprod Health 37: 110–118.
- 51. Fisher WA, Singh SS, Shuper PA, Carey M, Otchet F, et al. (2005) Characteristics of women undergoing repeat induced abortion. CMAJ 172: 637–641.
- 52. Hathaway JE, Willis G, Zimmer B, Silverman JG (2005) Impact of partner abuse on women's reproductive lives. J Am Med Womens Assoc 60: 42–45.
- 53. Raj A, Liu R, McCleary-Sills J, Silverman JG (2005) South Asian victims of intimate partner violence more likely than non-victims to report sexual health concerns. J Immigr Health 7: 85–91.
- 54. Woo J, Fine P, Goetzl L (2005) Abortion disclosure and the association with domestic violence. Obstet Gynecol 105: 1329–1334.
- 55. Janssen PA, Holt VL, Sugg NK, Emanuel I, Critchlow CM, et al. (2003) Intimate partner violence and adverse pregnancy outcomes: a population-based study. Am J Obstet Gynecol 188: 1341–1347.
- 56. Winn N, Records K, Rice M (2003) The relationship between abuse, sexually transmitted diseases, & group B streptococcus in childbearing women. MCN Am J Matern Child Nurs 28: 106–110.
- 57. Wiebe ER, Janssen P (2001) Universal screening for domestic violence in abortion. Womens Health Issues 11: 436–441.
- 58. Letourneau EJ, Holmes M, Chasedunn-Roark J (1999) Gynecologic health consequences to victims of interpersonal violence. Womens Health Issues 9: 115–120.
- 59. Glander SS, Moore ML, Michielutte R, Parsons LH (1998) The prevalence of domestic violence among women seeking abortion. Obstet Gynecol 91: 1002–1006.
- 60. Evins G, Chescheir N (1996) Prevalence of domestic violence among women seeking abortion services. Womens Health Issues 6: 204–210.
- 61. Holmes MM, Resnick HS, Kilpatrick DG, Best CL (1996) Rape-related pregnancy: estimates and descriptive characteristics from a national sample of women. Am J Obstet Gynecol 175: 320–324.
- 62. Torres A, Forrest JD (1988) Why do women have abortions? Fam Plann Perspect 20: 169–176.
- 63. Borins EF, Forsythe PJ (1985) Past trauma and present functioning of patients attending a women's psychiatric clinic. Am J Psychiatry 142: 460–463.
- 64. Diniz NM, Gesteira SM, Lopes RL, Santos Mota R, Perez BA, et al. (2011) [Voluntary abortion and domestic violence among women attended at a public maternity hospital of Salvador-BA.]. Rev Bras Enferm 64: 1010–1015.
- 65. Laanpere M, Ringmets I, Part K, Karro H (2013) Intimate partner violence and sexual health outcomes: a population-based study among 16–44-year-old women in Estonia. Eur J Public Health 23: 688–693.
- 66. Makenzius M, Tyden T, Darj E, Larsson M (2012) Risk factors among men who have repeated experience of being the partner of a woman who requests an induced abortion. Scand J Public Health 40: 211–216.
- 67. Johnson JK, John R, Humera A, Kukreja S, Found M, et al. (2007) The prevalence of emotional abuse in gynaecology patients and its association with gynaecological symptoms. Eur J Obstet Gynecol Reprod Biol 133: 95–99.
- 68. John R, Johnson JK, Kukreja S, Found M, Lindow SW (2004) Domestic violence: prevalence and association with gynaecological symptoms. BJOG 111: 1128–1132.
- 69. Keeling J, Birch L, Green P (2004) Pregnancy counselling clinic: a questionnaire survey of intimate partner abuse. J Fam Plann Reprod Health Care 30: 165–168.
- 70. Zsuzsa G, Jeno L, Szilvia A, Maria K (2004) [The psycho-social background factors of induced abortions based on a representative national survey.]. Lege Artis Med 14: 512–519.
- 71. Hedin LW, Janson PO (2000) Domestic violence during pregnancy. The prevalence of physical injuries, substance use, abortions and miscarriages. Acta Obstet Gynecol Scand 79: 625–630.
- 72. Pallitto CC, Garcia-Moreno C, Jansen HAFM, Heise L, Ellsberg M, et al. (2013) Intimate partner violence, abortion, and unintended pregnancy: results from the WHO Multi-country Study on Women's Health and Domestic Violence. Int J Gynaecol Obstet 120: 3–9.
- 73. Antai D, Adaji S (2012) Community-level influences on women's experience of intimate partner violence and terminated pregnancy in Nigeria: a multilevel analysis. BMC Pregnancy Childbirth 12: 128.
- 74. Stöckl H, Filippi V, Watts C, Mbwambo JK (2012) Induced abortion, pregnancy loss and intimate partner violence in Tanzania: a population based study. BMC Pregnancy Childbirth 12: 12.
- 75. Alio AP, Salihu HM, Nana PN, Clayton HB, Mbah AK, et al. (2011) Association between intimate partner violence and induced abortion in Cameroon. Int J Gynaecol Obstet 112: 83–87.
- 76. Okenwa L, Lawoko S, Jansson B (2011) Contraception, reproductive health and pregnancy outcomes among women exposed to intimate partner violence in Nigeria. Eur J Contracept Reprod Health Care 16: 18–25.
- 77. Emenike E, Lawoko S, Dalal K (2008) Intimate partner violence and reproductive health of women in Kenya. Int Nurs Rev 55: 97–102.
- 78. Kaye DK, Mirembe FM, Bantebya G, Johansson A, Ekstrom AM (2006) Domestic violence as risk factor for unwanted pregnancy and induced abortion in Mulago Hospital, Kampala, Uganda. Trop Med Int Health 11: 90–101.
- 79. Kaye DK, Mirembe F, Bantebya G, Johansson A, Ekstrom AM (2005) Reasons, methods used and decision-making for pregnancy termination among adolescents and older women in Mulago Hospital, Uganda. East Afr Med J 82: 579–585.
- 80. Kaye D (2001) Domestic violence among women seeking post-abortion care. Int J Gynaecol Obstet 75: 323–325.
- 81. Nair S, Raj A, Saggurti N, Naik DD, Dasgupta A, et al. (2013) Reproductive health concerns of women contending with spousal violence and husband's alcohol use in a Mumbai slum community. Int J Gynaecol Obstet 122: 268–269.
- 82. Nguyen PH, Nguyen SV, Nguyen MQ, Nguyen NT, Keithly SC, et al. (2012) The association and a potential pathway between gender-based violence and induced abortion in Thai Nguyen province, Vietnam. Glob Health Action 5: 1–11.
- 83. Shah N, Hossain N, Noonari M, Khan NH (2011) Maternal mortality and morbidity of unsafe abortion in a university teaching hospital of Karachi, Pakistan. J Pak Med Assoc 61: 582–586.
- 84. Kalyanwala S, Zavier AJF, Jejeebhoy S, Kumar R (2010) Abortion experiences of unmarried young women in India: evidence from a facility-based study in Bihar and Jharkhand. Int Perspect Sex Reprod Health 36: 62–71.
- 85. Lee-Rife SM (2010) Women's empowerment and reproductive experiences over the lifecourse. Soc Sci Med 71: 634–642.
- 86. Silverman JG, Gupta J, Decker MR, Kapur N, Raj A (2007) Intimate partner violence and unwanted pregnancy, miscarriage, induced abortion, and stillbirth among a national sample of Bangladeshi women. BJOG 114: 1246–1252.
- 87. Leung TW, Leung WC, Ng EHY, Ho PC (2005) Quality of life of victims of intimate partner violence. Int J Gynaecol Obstet 90: 258–262.
- 88. Wu J, Guo S, Qu C (2005) Domestic violence against women seeking induced abortion in China. Contraception 72: 117–121.
- 89. Fanslow J, Silva M, Whitehead A, et al. (2008) Pregnancy outcomes and intimate partner violence in New Zealand. Aust N Z J Obstet Gynaecol 48: 391–397.
- 90. Whitehead A, Fanslow J (2005) Prevalence of family violence amongst women attending an abortion clinic in New Zealand. Aust N Z J Obstet Gynaecol 45: 321–324.
- 91. Taft A, Watson L, Lee C (2004) Violence against young Australian women and associations with reproductive events: a cross-sectional analysis of a national sample. Aust N Z J Public Health 28: 324–329.
- 92. Webster J, Chandler J, Battistutta D (1996) Pregnancy outcomes and health care use: effects of abuse. Am J Obstet Gynecol 174: 760–767.
- 93. Kalyanwala S, Jejeebhoy SJ, Zavier AJF, Kumar R (2012) Experiences of unmarried young abortion-seekers in Bihar and Jharkhand, India. Cult, Health Sex 14: 241–255.
- 94. Puri S, Adams V, Ivey S, Nachtigall RD (2011) “There is such a thing as too many daughters, but not too many sons”: qualitative study of son preference and fetal sex selection among Indian immigrants in the United States. Soc Sci Med 72: 1169–1176.
- 95. Williams GB, Brackley MH (2009) Intimate partner violence, pregnancy and the decision for abortion. Issues Ment Health Nurs 30: 272–278.
- 96. Belton S (2007) Borders of fertility: unplanned pregnancy and unsafe abortion in Burmese women migrating to Thailand. Health Care Women Int 28: 419–433.
- 97. Renker PR (2002) “Keep a blank face. I need to tell you what has been happening to me.”: teens' stories of abuse and violence before and during pregnancy. MCN Am J Matern Child Nurs 27: 109–116.
- 98. Souza VL, Ferreira SL (2000) [Impact of spouse violence on the decision to have an abortion]. Rev Bras Enferm 53: 375–385.
- 99. Jewkes R, Watts C, Abrahams N, Penn-Kekana L, Garcia-Moreno C (2000) Ethical and methodological issues in conducting research on gender-based violence in Southern Africa. Reprod Health Matters 8: 93–103.
- 100. Coker AL (2007) Does physical intimate partner violence affect sexual health? A systematic review. Trauma Violence Abuse 8: 149–177.
- 101. Ellsberg M, Jansen HA, Heise L, Watts CH, Garcia-Moreno C, et al. (2008) Intimate partner violence and women's physical and mental health in the WHO multi-country study on women's health and domestic violence: an observational study. Lancet 371: 1165–1172.
- 102. Shah PS, Shah J (2010) Knowledge Synthesis Group on Determinants of Preterm LBWB (2010) Maternal exposure to domestic violence and pregnancy and birth outcomes: a systematic review and meta-analyses. J Womens Health (Larchmt) 19: 2017–2031.
- 103. Wu V, Huff H, Bhandari M (2010) Pattern of physical injury associated with intimate partner violence in women presenting to the emergency department: a systematic review and meta-analysis. Trauma Violence Abuse 11: 71–82.
- 104. Trevillion K, Oram S, Feder G, Howard LM (2012) Experiences of domestic violence and mental disorders: a systematic review and meta-analysis. PLoS ONE 7: e51740
- 105. Department of Health (2010/11) Guidance on the NHS standard contract for community services 2010/11. Available: http://webarchive.nationalarchives.gov.uk/20130107105354/http://www.dh.gov.uk/prod_consum_dh/groups/dh_digitalassets/dh/en/ps/documents/digitalasset/dh_111266.pdf. Accessed 10 March 2013.
- 106. O'Reilly R, Beale B, Gillies D (2010) Screening and intervention for domestic violence during pregnancy care: a systematic review. Trauma Violence Abuse 11: 190–201.
- 107. O'Campo P, Kirst M, Tsamis C, Chambers C, Ahmad F (2011) Implementing successful intimate partner violence screening programs in health care settings: evidence generated from a realist-informed systematic review. Soc Sci Med 72: 855–866.
- 108. Nelson HD, Bougatsos C, Blazina I (2012) Screening women for intimate partner violence and elderly and vulnerable adults for abuse: systematic review to update the 2004 U.S. Preventive Services Task Force recommendation. Rockville (Maryland): Agency for Healthcare Research and Quality.
- 109. Moyer VA (2013) Screening for intimate partner violence and abuse of elderly and vulnerable adults: U.S. Preventive Services Task Force recommendation statement. Ann Int Med 158: 478–486.
- 110. National Institute for Health and Care Excellence (2013) Domestic violence and abuse—identification and prevention. Available: http://guidance.nice.org.uk/PHG/44. Accessed 3 December 2013.
- 111. Lee R, Stanko E (2002) Researching violence: methodology and measurement. London: Routledge.
- 112. Ramsay J, Carter Y, Davidson L, Dunne D, Eldridge S, et al. (2009) Advocacy interventions to reduce or eliminate violence and promote the physical and psychosocial well-being of women who experience intimate partner abuse. Cochrane Database Syst Rev 2009: CD005043.
- 113. Jahanfar S, Janssen PA, Howard LM, Dowswell T (2013) Interventions for preventing or reducing domestic violence against pregnant women. Cochrane Database Syst Rev 2013: CD009414.
- 114. Cismaru M, Lavack AM (2011) Campaigns targeting perpetrators of intimate partner violence. Trauma Violence Abuse 12: 183–197.
- 115. Bacchus L, Aston G, Torres Vitolas C, Jordan P, Murray SF (2007) A theory-based evaluation of a multi-agency domestic violence service at Guy's and St Thomas' NHS Foundation Trust. Available: http://www.caada.org.uk/policy/Bacchus-et-al-2007-full-report-MOZAIC.pdf. Accessed 12 December 2013.
- 116. Granja AC, Zacarias E, Bergstrom S (2002) Violent deaths: the hidden face of maternal mortality. BJOG 109: 5–8.
- 117. Gissler M, Berg C, Bouvier-Colle MH, Buekens P (2005) Injury deaths, suicides and homicides associated with pregnancy, Finland 1987–2000. Eur J Public Health 15: 459–463.
- 118. Grossman D, Ellertson C, Grimes DA, Walker D (2004) Routine follow-up visits after first-trimester induced abortion. Obstet Gynecol 103: 738–745.
- 119. Hegarty K, O'Doherty L, Taft A, Chondros P, Brown S, et al. (2013) Screening and counselling in the primary care setting for women who have experienced intimate partner violence (WEAVE): a cluster randomised controlled trial. Lancet 382: 249–258.
- 120. Jewkes R (2013) Intimate partner violence: the end of routine screening. Lancet 382: 190–191.
- 121. World Health Organization (2013) Responding to intimate partner violence and sexual violence against women: WHO clinical and policy guidelines. Geneva: World Health Organization.