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Sedentary behavior mediates the association between weight-adjusted waist index and cardiovascular disease in patients with diabetes

  • Zhihui Li ,

    Contributed equally to this work with: Zhihui Li, Min Wu, Peng Wang

    Roles Methodology, Software, Writing – original draft

    Affiliation The Second Affiliated Hospital of Baotou Medical College, Inner Mongolia, Baotou, China

  • Min Wu ,

    Contributed equally to this work with: Zhihui Li, Min Wu, Peng Wang

    Roles Data curation, Methodology, Writing – original draft

    Affiliation The Second Affiliated Hospital of Baotou Medical College, Inner Mongolia, Baotou, China

  • Peng Wang ,

    Contributed equally to this work with: Zhihui Li, Min Wu, Peng Wang

    Roles Formal analysis, Methodology, Software, Validation

    Affiliation The Second Affiliated Hospital of Baotou Medical College, Inner Mongolia, Baotou, China

  • Wei Xie,

    Roles Conceptualization, Investigation, Writing – original draft, Writing – review & editing

    Affiliation Inner Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Inner Mongolia, Baotou, China

  • Yunqi Hua,

    Roles Formal analysis, Writing – original draft

    Affiliation Department of Medical Oncology, Baotou Cancer Hospital, Baotou, China

  • Guo Shao ,

    Roles Conceptualization, Funding acquisition, Investigation, Methodology, Resources, Writing – review & editing

    zhwyjs@163.com (HZ); shao.guo.china@gmail.com (GS)

    ‡ GS and HZ also contributed equally to this work.

    Affiliation Center for Translational Medicine, the Third People’s Hospital of Longgang District, Shenzhen, China

  • Hongwei Zhu

    Roles Formal analysis, Funding acquisition, Investigation, Methodology, Supervision, Writing – original draft

    zhwyjs@163.com (HZ); shao.guo.china@gmail.com (GS)

    ‡ GS and HZ also contributed equally to this work.

    Affiliation The Second Affiliated Hospital of Baotou Medical College, Inner Mongolia, Baotou, China

Abstract

Background

Obesity and cardiovascular disease (CVD) are both associated with sedentary behavior. However, the role that sedentary behavior plays in the relationship between obesity and CVD in patients with diabetes remains unclear. This study aimed to examine how the weight-adjusted waist index (WWI) relates to CVD risk in patients with diabetes and to explore sedentary behavior’s potential mediating role in this relationship.

Methods

The present study analyzed data from 4,937 participants across seven NHANES cycles (2007–2020). Using logistic regression models and restricted cubic spline analyses, we evaluated the associations between WWI, sedentary behavior, and CVD in patients with diabetes. Subgroup and sensitivity analyses were conducted to confirm the stability of the results. Mediation analysis explored the mediating role of sedentary behavior in the associations between WWI and CVD.

Results

The present study found that diabetic patients with CVD had higher WWI levels (11.8 ± 0.69)compared to diabetic patients without CVD (11.60 ± 0.73). WWI was positively associated with CVD in patients with diabetes(OR = 1.27, 95% CI: 1.06–1.53; P < 0.01), even after accounting for potential confounders. Sedentary behavior was also positively associated with CVD(OR = 1.04, 95% CI: 1.02–1.07; P < 0.01). In a restricted cubic spline analysis, we found that WWI and sedentary time were positively correlated and approximately linearly associated with CVD risk in patients with diabetes. As WWI levels and sedentary time increased, the risk of CVD increased in patients with diabetes. Mediating analysis revealed that sedentary behaviour mediated 13.43% of the association between WWI and CVD in patients with diabetes.

Conclusion

We found that WWI is associated with an increased risk of CVD in patients with diabetes, and sedentary behavior partially mediates this relationship. Reducing sedentary behavior may be a key strategy to reduce obesity and CVD risk in patients with diabetes.

Introduction

Diabetes is becoming more prevalent worldwide, with approximately 10.2% of the population estimated to suffer from it by 2030 [1]. As a major health challenge in the twenty-first century, diabetes has been recognized as a significant contributor to global disease burden [2]. Cardiovascular disease (CVD) is the leading cause of morbidity and mortality in diabetic patients [3]. Therefore, the primary treatment strategies for diabetic patients is the early identification of CVD risk factors, followed by the implementation of effective preventive measures.

Obesity, particularly central obesity, is a significant global public health concern [4]. Long-term research has demonstrated a strong correlation between obesity and an increased risk of CVD incidence and mortality [5,6]. Identifying individuals at high risk of obesity is crucial for preventing the development of CVD. While body mass index (BMI) is the most commonly used tool for diagnosing obesity [7], its limitations in accurately assessing visceral and subcutaneous fat distribution have become increasingly evident as research has evolved [810]. Recent studies have suggested that WWI is a superior predictor of obesity, particularly central obesity [11]. Research has shown that an elevated WWI is closely associated with various disorders, including diabetes [12], abdominal aortic calcification [13], hyperuricemia [14], cardiovascular disease [15], and stroke [16]. The WWI has a pronounced prognostic impact on the prevalence and mortality rates of CVD [17]. Therefore, the WWI is regarded as a refined, prospective, and more precise indicator for assessing obesity and related health risks.

Sedentary behavior, defined as activities that require minimal energy expenditure while awake, has become a common lifestyle in modern society [18,19]. Growing research demonstrates a significant association between sedentary behavior and a variety of chronic diseases [20], such as diabetes [21,22], cardiovascular disease [23], obesity [24], sarcopenia [25], and depression [26,27]. Given that sedentary behavior is a modifiable risk factor, addressing it is essential, as it has the potential to influence disease incidence and mortality significantly.

Therefore, we hypothesized that the association between WWI and CVD in diabetic patients may be mediated by sedentary behavior. The objectives of our investigation were to identify the relationship between WWI and CVD in diabetic patients and to evaluate the potential mediating role of sedentary behavior in this association. These findings may contribute to the formulation of targeted public health guidelines aimed at reducing the incidence of adverse cardiovascular outcomes in patients with diabetes through modifications in sedentary behavior.

Materials and methods

Data source

This study utilized data from the National Health and Nutrition Examination Survey(NHANES), a nationally representative cross-sectional survey conducted by the National Center for Health Statistics (NCHS) in the United States [28]. Since 1999, NHANES has been conducted in a 2-year cycle. For each cycle, new participants are randomly selected from the U.S. civilian noninstitutionalized population using a complex, multistage probability sampling design to ensure national representativeness. The survey was designed to gather information on the nutritional and health status of the American population. The participants’ demographic, socioeconomic, dietary, and health-related data were collected through questionnaires, physical examinations, and laboratory tests. The study protocol was evaluated and approved by the NCHS Research Ethics Review Committee, and written informed consent was obtained from each participant [29]. The NHANES database is publicly accessible, which waived the need for ethical review for this study. Detailed statistical data are available at https://wwwn.cdc.gov/nchs/nhanes/default.aspx

Selection criteria for study population

This study integrated data from seven NHANES cycles, which were conducted between 2007 and 2020. The criteria for the diagnosis of diabetes were as follows [30,31]: 1) self-reported physician-diagnosed DM; 2) current use of diabetes medication or insulin therapy to lower blood glucose level; 3) a glycated hemoglobin (HbA1c) level of ≥6.5%; 4) a fasting plasma glucose level of ≥7.0 mmol/L; or 5) a two-hour glucose (OGTT) mmol/L level of ≥11.1 mmol/L. Participants meeting any of these criteria were included in the analysis. The exclusion criteria were as follows: 1) age < 20 years; 2) pregnancy; 3) missing data on body weight, waist circumference, or sedentary time; and 4) invalid questionnaires regarding CVD history.

Exposure variable: WWI and sedentary behavior

Sedentary behavior was the mediating variable in the current study. Sedentary behavior was assessed through an interview via the Global Physical Activity Questionnaire (GPAQ) [32,33]. This assessment was conducted by trained interviewers at a mobile examination center via a computer-assisted personal interview system. The participants were asked, “The following question concerns time spent sitting at school, at home, while traveling, or during social activities, including desk work, car or bus travel, reading, playing cards, watching TV, or using a computer. Please exclude sleep time. On a typical day, how much time do you usually spend sitting?” The responses were recorded in minutes. Individuals were classified as having sedentary behavior if their daily sedentary time was 360 minutes or more [34].

In this study, the WWI as the exposure variable. The formula for WWI is as follows: [35]. The physical data, including body weight and waist circumference, were collected by trained technicians at the Mobile Examination Center (MEC). The complete methods, which include protocols, equipment, and quality control, are available at the following website:https://wwwn.cdc.gov/nchs/nhanes/continuousnhanes/manual.aspx.

Outcomes variable: CVD

This study’s outcome variable was CVD. According to prior research, CVD was defined as the presence of any of five self-reported cardiovascular outcomes: angina pectoris, coronary heart disease (CHD), congestive heart failure (CHF), heart attack, and stroke [36,37]. The following questions were posed to all participants: “Has a doctor or other health professional ever told you that you have congestive heart failure/coronary heart disease/angina/heart attack/stroke?” An answer of “yes” to these questions indicated CVD.

Covariates definition

During the household interviews, standardized questionnaires were used to collect data on age, sex, race, education level, marital status, poverty-income-ratio, smoking status, disease conditions, and medication use. The questionnaires were administered by professionally trained medical personnel. Race was categorized as Mexican American, non-Hispanic White, non-Hispanic Black, or other. There were three education levels: less than high school, high school or equivalent, and college or above. Marital status was categorized as either partnered or unpartnered. Smoking status was divided into two categories: never smoked and smoker. The poverty-income-ratio was categorized into three categories: 0--1.0, 1.0--3.0, and >3.0. The participants were classified into 4 alcohol consumption groups on the basis of the self-report survey results for these questionnaires, as described in previous studies [38]. These are classified as follows: 1) never drinker (had < 12 drinks in a lifetime); 2) mild alcohol user (≤ 1 drink per day for females, ≤ 2 drinks per day for males on average over the past year, or binge drinking (≥ 4 drinks/occasion for females, ≥ 5 drinks/occasion for males on 1 day per month); 3) moderate alcohol user (≤ 2 drinks per day for females, ≤ 3 drinks per day for males, or binge drinking on 2 ~ 5 days per month); and 4) heavy alcohol user (≥ 3 drinks per day for females, ≥ 4 drinks per day for males, or binge drinking ≥ 5 days per month). The Mobile Examination Center conducted medical examinations and subsequent laboratory assessments to obtain anthropometric measurements and biochemical parameters. The body mass index(BMI) was determined by dividing the weight in kilograms by the height in meters squared. The results were categorized as≤ 25.0 kg/m², 25.0–30.0 kg/m², and >30.0 kg/m². Furthermore, fasting blood samples were examined at baseline for higher high-density lipoprotein levels, triglycerides, blood urea nitrogen, serum creatinine, serum albumin, serum uric acid, alanine aminotransferase, white blood cell count, and glycated hemoglobin.

Missing value management

Variables with more than 15% missing values, including those related to systolic blood pressure, diastolic blood pressure, LDL, and insulin levels, were initially excluded by the researchers. For the study’s outcome, mediation variable, and exposure variables, data with missing values were excluded. Multiple imputation methods were employed to impute other missing values. Using the “mice” package in R software, the random forest algorithm (trained on other non-missing variables) was implemented to perform multiple imputations.

Statistical analysis

Means ± standard deviations were used for continuous variables that conformed to a normal distribution, while medians (25th percentile, 75th percentile) were used for continuous variables that did not conform to a normal distribution. The baseline differences in continuous variables were assessed via analysis of variance (ANOVA). One-way ANOVA was conducted for normally distributed continuous variables, whereas the Kruskal-Wallis test was employed for non-normally distributed continuous variables. Logistic regression analysis was used to assess the associations among WWI, sedentary behavior, and CVD in diabetic patients. To account for potential confounding, the logistic regression models were adjusted for age, sex, race, poverty-income-ratio, insulin use, marital status, hypertension, total cholesterol, blood urea nitrogen, serum albumin, and smoking status. Restricted cubic splines (RCS) were used to analyze the relationships among WWI, sedentary behavior, and CVD in diabetic patients. The findings were further stratified to consider the effects of sex, race, marital status, poverty income ratio, smoking status, glycosylated hemoglobin, and alcohol consumption. In addition, likelihood ratio tests were used to assess the interaction between WWI and subgroups. To test the robustness of our findings, we performed a sensitivity analysis. First, multiple imputation was applied to variables with missing values, and the association between WWI and CVD risk in patients with diabetes was validated across 10 imputed complete datasets. Second, we deleted people older than 70 years to verify the association between WWI and CVD risk in patients with diabetes. Third, we additionally adjusted for dietary inflammatory index (DII), total physical activity (MET-minutes/week), medication adherence, education level, and poverty-income-ratio. Finally, we validated the association by stratifying WWI into tertiles. Mediation analyses were performed using the “Mediation” package in R software. The mediating effect of sedentary behavior on the association between WWI and diabetes-related CVD was assessed after adjusting for age, sex, race, poverty-income-ratio, insulin use, marital status, hypertension, total cholesterol, plasma urea nitrogen, serum albumin, and smoking status. The presence of a mediating effect was defined as meeting all of the following conditions: significant indirect effect, significant total effect, and positively proportional mediating effect. The data were analyzed via R software (version 4.3.2). P values <0.05 were considered statistically significant (two-tailed).

Results

Baseline characteristics and results analysis of the study participants

Between 2007 and 2020, the NHANES cycles identified a total of 8,703 non-pregnant diabetic patients aged 20 years or older. Of these, 3,047 participants were excluded due to missing sedentary time data, 110 due to missing cardiovascular outcome data, and 607 due to missing waist circumference or weight data. The final analytical sample consisted of 4,937 participants. A detailed screening process is illustrated in Fig 1 and S1 Data provides comprehensive information on the enrolled population.

Table 1 presents the differences in demographic and clinical characteristics between diabetic patients with and without CVD. Supplementary Table 1 in S1 File presents baseline characteristics of patients with T2DM by WWI quartiles. The study included 4,937 patients with diabetes, of whom 1,083 had CVD. Among all participants, 2,536 (44.9%) were male, and the mean age was 62 years. The mean WWI was significantly higher in diabetic patients with CVD (11.80 ± 0.69) compared to those without CVD (11.60 ± 0.73). Diabetic patients with CVD were significantly older, more likely to be male, and had lower educational attainment and a lower poverty-income-ratio. They also exhibited higher levels of blood urea nitrogen, serum creatinine, and serum uric acid. Additionally, CVD patients had higher rates of hypertension, greater insulin use, longer sedentary time, and higher smoking prevalence. Conversely, they had higher high-density lipoprotein (HDL) levels and lower serum albumin levels. Notably, CVD patients also had higher rates of overweight and sedentary behavior.

Association between WWI and CVD in diabetes

The association between WWI and CVD in patients with diabetes was analyzed using three logistic regression models, with progressive adjustments for confounding variables (Table 2). WWI was considered both a continuous and categorical variable. When treated as a continuous variable, WWI was significantly associated with an increased risk of CVD in patients with diabetes. In Model 1 (unadjusted), WWI showed a significant positive association with CVD (OR = 1.69, 95% CI = 1.47–1.94, P < 0.001). This association persisted after adjusting for age, gender, and race in Model 2 (OR = 1.54, 95% CI = 1.30–1.84, P < 0.001) and after multivariable adjustment in Model 3 (OR = 1.27, 95% CI = 1.06–1.53, P < 0.01). Similarly, a dose-response relationship was observed across WWI quartiles (Q1-Q4), with the highest quartile (Q4) showing the strongest association in all models (P for trend <0.001 in all models).

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Table 2. Logistic regression analysis of the associations among WWI, sedentary time and CVD in patients with diabetes mellitus.

https://doi.org/10.1371/journal.pone.0331173.t002

Association between sedentary behavior and CVD in diabetes

Sedentary time exhibited a significant association with CVD in patients with diabetes, regardless of whether it was analyzed as a continuous variable or categorized (Table 2). When analyzed as a continuous variable, increased sedentary time was significantly associated with increased CVD risk in all models (P < 0.001 in all models). In the fully adjusted categorical model, using the group with sedentary time <6 hours as the reference, individuals with sedentary time ≥6 hours had a significantly higher risk of CVD (OR = 1.28, 95% CI = 1.06–1.55, P < 0.01) in patients with diabetes. These findings highlight a robust positive association between prolonged sedentary behavior and CVD risk among patients with diabetes.

Association between WWI and sedentary behavior in diabetes

The logistic regression analysis results for the association between WWI and sedentary behavior in patients with diabetes mellitus are presented in Table 3. The analysis was conducted using three models, with Model 1 being unadjusted, Model 2 adjusted for age, gender, and race, and Model 3 adjusted for multivariate variables including age, gender, race, insulin use, hypertension, total cholesterol, blood urea nitrogen, serum albumin, and smoking status. When WWI was analyzed as a continuous variable, we found that an increase in WWI was associated with an increase in sedentary behavior in diabetic patients (Model 1: OR = 1.28, 95% CI: 1.15–1.43; Model 2: OR = 1.37, 95% CI: 1.21–1.55; all P < 0.001). This association remained in the fully adjusted Model 3 (OR = 1.39, 95% CI: 1.23–1.58, P < 0.001). WWI as a categorical variable was significantly associated with increased sedentary behavior in the fourth quartile in the fully adjusted categorical model using the lowest quartile of WWI as the baseline, with an odds ratio (OR) of 1.89 (95% CI 1.41–2.54). This finding underscores the positive association between elevated WWI values and the likelihood of sedentary behavior in diabetic patients. (Table 3).

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Table 3. Logistic regression analysis of the association between WWI and sedentary behavior in patients with diabetes mellitus.

https://doi.org/10.1371/journal.pone.0331173.t003

RCS analysis

The RCS analysis further explored the associations between WWI, sedentary time, and CVD in patients with diabetes, as shown in Fig 2. In the fully adjusted model, RCS analysis revealed that both WWI and sedentary time exhibited approximately linear relationships with CVD risk in patients with diabetes (P for nonlinearity >0.05). Specifically, WWI and sedentary time were positively associated with CVD risk, as depicted in Fig 2A and 2B, respectively.

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Fig 2. RCS curves for WWI, sedentary behavior and CVD in patients with diabetes (A) Association between WWI and CVD in diabetes patients.

(B) Association between sedentary time and CVD in diabetes patients from NHANES 2007–2020.

https://doi.org/10.1371/journal.pone.0331173.g002

Mediating effect of sedentary behavior on WWI and CVD in diabetes patients

Based on the mediation model adjusted for age, sex, race, poverty-income-ratio, insulin use, marital status, hypertension, total cholesterol, plasma urea nitrogen, serum albumin, and smoking status, the total effect of sedentary behavior at WWI on CVD in diabetes patients was significant (total effect, 0.0067, 95% CI, 0.003–0.008; P < 0.001). Sedentary behavior partially mediated the association WWI and CVD in patients with diabetes (indirect effect, 0.0009; 95% CI, 0.0002–0.001; P < 0.001). The proportion that was mediated was 13.43% (0.0009/0.0067). (Fig 3).

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Fig 3. Mediation models illustrating the relationship between WWI and CVD in patients with diabetes, with sedentary behavior as the mediator.

https://doi.org/10.1371/journal.pone.0331173.g003

Subgroup analysis analyses

We performed subgroup analyses stratified by sex, marital status, race, education level, poverty-income-ratio, smoking status, glycated hemoglobin, alcohol status, and BMI. The P-values for interaction were greater than 0.05 across all groups. These analyses demonstrated that the association between WWI and CVD remained stable across various subgroups (Fig 4).

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Fig 4. Forest plot for the associations among WWI, sedentary behavior and CVD in patients with diabetes.

https://doi.org/10.1371/journal.pone.0331173.g004

Sensitivity analyses

To assess the robustness of our findings, we conducted several sensitivity analyses. First, we evaluated the association between WWI and CVD in 10 imputed datasets to address potential bias from missing data. The results were consistent across all imputed datasets (Supplementary Figure 1 in S1 File), further supporting the robustness of our findings. Second, we repeated the analysis after excluding participants aged 70 years or older. Multivariable logistic regression confirmed that the association between WWI and CVD persisted, with results consistent with our initial findings (Supplementary Table 2 in S1 File). Third, additional adjustment for dietary inflammatory index (DII), physical activity (MET-minutes/week), medication adherence, education level, and poverty-income-ratio yielded essentially unchanged associations(Supplementary Table 3 in S1 File). Finally, participants in the highest WWI tertile exhibited a considerably elevated risk of CVD compared to those in the lowest tertile (Supplementary Table 4 in S1 File).

Discussion

Our findings indicate that elevated WWI levels are positively associated with increased CVD risk in patients with diabetes, with similar trends observed for sedentary behavior. RCS analysis revealed a positive and approximately linear relationship between WWI and CVD risk in patients with diabetes. Mediation analysis further demonstrated that sedentary behavior accounted for 13.43% of the association between WWI and CVD, suggesting a partial mediating role. These results imply that strategies targeting sedentary behavior reduction may be effective in mitigating both central obesity and CVD risk in patients with diabetes.

Obesity, particularly central obesity, is associated with metabolic disorders such as insulin resistance and hyperinsulinemia [39], which are major contributors to diabetes [40] and recognized risk factors for CVD and mortality in adults [41]. In diabetic patients, cardiovascular complications are the leading causes of mortality and disability [42]. Thus, identifying simple and effective methods to assess obesity and determine CVD risk in diabetic individuals is a critical issue in clinical practice. The “obesity paradox” has been the subject of an expanding number of studies in recent years [4346]. This phenomenon is characterized by individuals with overweight or obesity, as measured by BMI, having a lower all-cause mortality rate than those with normal weight [47,48]. This paradox has been observed in both general and high-risk populations. Similar outcomes have been reported when obesity is measured by WC [49]. The consensus is that this phenomenon arises because BMI and WC fail to distinguish between muscle mass and fat mass. To address this limitation, Park Y et al. introduced a novel obesity indicator termed the “WWI” [11]. In addition to diminishing the relationship between waist circumference and BMI, the WWI also incorporates the advantages of waist circumference, better reflects body fat distribution and muscle mass, and addresses the issue of central obesity, which is unrelated to weight [50,51]. In a study of 602 elderly individuals, Ansan et al. demonstrated that WWI correlates with adipose and muscle mass as measured by dual-energy X-ray absorptiometry, bioelectrical impedance analysis, and abdominal computed tomography [17]. These findings suggest that WWI may be a more accurate indicator for predicting abdominal adiposity in adults. WWI has been associated with various conditions, including fatty liver [52], cognitive function [53], hyperuricemia [14], diabetes [12], kidney stones [54,55], and urinary incontinence [56]. Additionally, studies have shown that WWI is positively associated with CVD [15], cardiovascular mortality, and all-cause mortality [50,57]. In this study, we included 4,937 adults with diabetes and found that WWI was positively associated with CVD risk, regardless of whether WWI was treated as a continuous or categorical variable.

Sedentary behavior, defined as any waking behavior with an energy expenditure of ≤1.5 metabolic equivalents while in a sitting, reclining, or lying position, is becoming increasingly prevalent in the population and is associated with various adverse health outcomes [58]. Extensive epidemiological studies have shown correlations between sedentary behavior and elevated risks of cardiovascular disease [59], diabetes [60,61], cancer [62], and overall mortality [63,64]. Recent evidence consistently indicates a strong association between sedentary behavior and the risk of cardiovascular diseases [65]. Our study extends these findings to diabetic populations, demonstrating a positive correlation between sedentary time and cardiovascular disease risk in this population. These results underscore sedentary behavior as a significant modifiable risk factor for cardiovascular disease in diabetes patients. Notably, our mediation analysis revealed that sedentary behavior mediated 13.43% of the association between WWI and cardiovascular disease (CVD), suggesting its partial intermediary role in this pathway. From a mechanistic perspective, this mediation may occur through several distinct pathways: First, sedentary behavior is strongly associated with metabolic disorders, including insulin resistance, dyslipidemia, and chronic inflammation, which are key contributors to CVD risk in diabetic patients [66]. Second, sedentary behavior may impair vascular endothelial function and induce hemodynamic changes that promote atherosclerosis [67]. Additionally, increased sympathetic nerve activity and blood pressure during prolonged sedentary periods may further exacerbate CVD risk [68]. These findings carry important clinical implications. Behavior interventions targeting sedentary time reduction could serve as an adjunctive strategy to weight management in obese diabetic patients. Particularly for patients struggling with weight loss, focusing initially on reducing and interrupting sedentary periods may provide cardiovascular protection while working toward long-term weight management goals.

A significant strength of our study is the use of a large and representative NHANES database, which enhances the generalizability of our findings. Our results provide robust evidence supporting the positive association between WWI and CVD risk in patients with diabetes. Furthermore, our study highlights the potential of WWI as an easily obtainable anthropometric index for identifying individuals at risk of CVD among diabetic patients. Given its straightforward calculation and low economic cost, WWI is an ideal option for healthcare institutions, particularly those with limited medical resources. Additionally, sedentary behavior, a modifiable risk factor, offers a pathway to mitigate CVD risk in diabetic patients with elevated WWI levels through early assessment and timely intervention.

However, there are several limitations in this study. First, as a cross-sectional study, our research can only demonstrate associations among WWI, sedentary behavior, and CVD development in people with diabetes but cannot establish causality. Future prospective studies and randomized controlled trials (RCTs) are needed to determine whether reducing sedentary behavior directly mitigates CVD risk or modifies WWI in this population. Second, the use of self-reported questionnaires to assess CVD and sedentary behavior has inherent limitations, including potential recall bias and inaccuracies in self-diagnosis. Therefore, further prospective randomized controlled trials are needed to verify the results of this study. While self-report is a practical method for large epidemiological studies, future research would benefit from incorporating objective measures such as medical record verification for CVD diagnoses and accelerometer data for sedentary behavior assessment. Third, while we comprehensively adjusted for potential confounders, residual confounding from unmeasured variables remains possible. Fourth, the study population was derived from U.S. databases, which may limit the generalizability of our findings to other ethnic groups or populations. Additionally, our research focused solely on diabetic patients; therefore, caution should be exercised when extrapolating these results to non-diabetic populations. Future multicenter studies involving diverse populations are warranted to validate our findings.

Conclusion

The findings of this study demonstrate that an elevated WWI is associated with an increased risk of CVD in patients with diabetes. Furthermore, the results suggest that sedentary behavior may serve as a mediator in the positive association between WWI and CVD incidence. Thus, early clinical surveillance to identify individuals with a high WWI and the implementation of active weight management strategies may assist in mitigating CVD risk in individuals with diabetes.

Supporting information

S1 Data. Data used for analysis in the study.

https://doi.org/10.1371/journal.pone.0331173.s002

(XLSX)

References

  1. 1. Saeedi P, Petersohn I, Salpea P, Malanda B, Karuranga S, Unwin N, et al. Global and regional diabetes prevalence estimates for 2019 and projections for 2030 and 2045: results from the International Diabetes Federation Diabetes Atlas, 9th edition. Diabetes Res Clin Pract. 2019;157:107843. pmid:31518657
  2. 2. Sun H, Saeedi P, Karuranga S, Pinkepank M, Ogurtsova K, Duncan BB, et al. IDF Diabetes Atlas: global, regional and country-level diabetes prevalence estimates for 2021 and projections for 2045. Diabetes Res Clin Pract. 2022;183:109119. pmid:34879977
  3. 3. Dal Canto E, Ceriello A, Rydén L, Ferrini M, Hansen TB, Schnell O, et al. Diabetes as a cardiovascular risk factor: an overview of global trends of macro and micro vascular complications. Eur J Prev Cardiol. 2019;26(2_suppl):25–32. pmid:31722562
  4. 4. Elagizi A, Kachur S, Lavie CJ, Carbone S, Pandey A, Ortega FB, et al. An overview and update on obesity and the obesity paradox in cardiovascular diseases. Prog Cardiovasc Dis. 2018;61(2):142–50. pmid:29981771
  5. 5. Piché M-E, Tchernof A, Després J-P. Obesity phenotypes, diabetes, and cardiovascular diseases. Circ Res. 2020;126(11):1477–500. pmid:32437302
  6. 6. Chartrand DJ, Murphy-Després A, Alméras N, Lemieux I, Larose E, Després J-P. Overweight, obesity, and CVD risk: a focus on visceral/ectopic fat. Curr Atheroscler Rep. 2022;24(4):185–95. pmid:35235165
  7. 7. Almuwaqqat Z, Hui Q, Liu C, Zhou JJ, Voight BF, Ho Y-L, et al. Long-term body mass index variability and adverse cardiovascular outcomes. JAMA Netw Open. 2024;7(3):e243062. pmid:38512255
  8. 8. Antonopoulos AS, Oikonomou EK, Antoniades C, Tousoulis D. From the BMI paradox to the obesity paradox: the obesity-mortality association in coronary heart disease. Obes Rev. 2016;17(10):989–1000. pmid:27405510
  9. 9. Romero-Corral A, Somers VK, Sierra-Johnson J, Thomas RJ, Collazo-Clavell ML, Korinek J, et al. Accuracy of body mass index in diagnosing obesity in the adult general population. Int J Obes (Lond). 2008;32(6):959–66. pmid:18283284
  10. 10. Alebna PL, Mehta A, Yehya A, daSilva-deAbreu A, Lavie CJ, Carbone S. Update on obesity, the obesity paradox, and obesity management in heart failure. Prog Cardiovasc Dis. 2024;82:34–42. pmid:38199320
  11. 11. Park Y, Kim NH, Kwon TY, Kim SG. A novel adiposity index as an integrated predictor of cardiometabolic disease morbidity and mortality. Sci Rep. 2018;8(1):16753. pmid:30425288
  12. 12. Zheng D, Zhao S, Luo D, Lu F, Ruan Z, Dong X, et al. Association between the weight-adjusted waist index and the odds of type 2 diabetes mellitus in United States adults: a cross-sectional study. Front Endocrinol (Lausanne). 2024;14:1325454. pmid:38292766
  13. 13. Qin Z, Chang K, Yang Q, Yu Q, Liao R, Su B. The association between weight-adjusted-waist index and increased urinary albumin excretion in adults: a population-based study. Front Nutr. 2022;9:941926. pmid:36034904
  14. 14. Ding Y, Xu Z, Zhou X, Luo Y, Xie R, Li Y. Association between weight-adjusted-waist index and the risk of hyperuricemia in adults: a population-based investigation. Front Endocrinol (Lausanne). 2023;14:1236401. pmid:37900143
  15. 15. Fang H, Xie F, Li K, Li M, Wu Y. Association between weight-adjusted-waist index and risk of cardiovascular diseases in United States adults: a cross-sectional study. BMC Cardiovasc Disord. 2023;23(1):435. pmid:37658325
  16. 16. Ye J, Hu Y, Chen X, Yin Z, Yuan X, Huang L, et al. Association between the weight-adjusted waist index and stroke: a cross-sectional study. BMC Public Health. 2023;23(1):1689. pmid:37658310
  17. 17. Kim NH, Park Y, Kim NH, Kim SG. Weight-adjusted waist index reflects fat and muscle mass in the opposite direction in older adults. Age Ageing. 2021;50(3):780–6. pmid:33035293
  18. 18. You Y, Chen Y, Fang W, Li X, Wang R, Liu J, et al. The association between sedentary behavior, exercise, and sleep disturbance: a mediation analysis of inflammatory biomarkers. Front Immunol. 2023;13:1080782. pmid:36713451
  19. 19. Raffin J, de Souto Barreto P, Le Traon AP, Vellas B, Aubertin-Leheudre M, Rolland Y. Sedentary behavior and the biological hallmarks of aging. Ageing Res Rev. 2023;83:101807. pmid:36423885
  20. 20. Dempsey PC, Matthews CE, Dashti SG, Doherty AR, Bergouignan A, van Roekel EH, et al. Sedentary behavior and chronic disease: mechanisms and future directions. J Phys Act Health. 2020;17(1):52–61. pmid:31794961
  21. 21. Yu P, Zhu Z, He J, Gao B, Chen Q, Wu Y, et al. Effects of high-intensity interval training, moderate-intensity continuous training, and guideline-based physical activity on cardiovascular metabolic markers, cognitive and motor function in elderly sedentary patients with type 2 diabetes (HIIT-DM): a protocol for a randomized controlled trial. Front Aging Neurosci. 2023;15:1211990. pmid:37649720
  22. 22. Lemes ÍR, Sui X, Turi-Lynch BC, Lee D-C, Blair SN, Fernandes RA, et al. Sedentary behaviour is associated with diabetes mellitus in adults: findings of a cross-sectional analysis from the Brazilian National Health System. J Public Health (Oxf). 2019;41(4):742–9. pmid:30260410
  23. 23. Duran AT, Romero E, Diaz KM. Is sedentary behavior a novel risk factor for cardiovascular disease? Curr Cardiol Rep. 2022;24(4):393–403. pmid:35182312
  24. 24. Silveira EA, Mendonça CR, Delpino FM, Elias Souza GV, Pereira de Souza Rosa L, de Oliveira C, et al. Sedentary behavior, physical inactivity, abdominal obesity and obesity in adults and older adults: a systematic review and meta-analysis. Clin Nutr ESPEN. 2022;50:63–73. pmid:35871953
  25. 25. Mo Y, Zhou Y, Chan H, Evans C, Maddocks M. The association between sedentary behaviour and sarcopenia in older adults: a systematic review and meta-analysis. BMC Geriatr. 2023;23(1):877. pmid:38124026
  26. 26. Wang X, Li Y, Fan H. The associations between screen time-based sedentary behavior and depression: a systematic review and meta-analysis. BMC Public Health. 2019;19(1):1524. pmid:31727052
  27. 27. Huang Y, Xu P, Fu X, Ren Z, Cheng J, Lin Z, et al. The effect of triglycerides in the associations between physical activity, sedentary behavior and depression: an interaction and mediation analysis. J Affect Disord. 2021;295:1377–85. pmid:34565593
  28. 28. Akinbami LJ, Chen TC, Davy O, Ogden CL, Fink S, Clark J, et al. National Health and Nutrition Examination Survey, 2017-March 2020 prepandemic file: sample design, estimation, and analytic guidelines. Vital and health statistics Ser 1, Programs and collection procedures. 2022;(190):1–36. 35593699.
  29. 29. Xu B, Wu Q, La R, Lu L, Abdu FA, Yin G, et al. Is systemic inflammation a missing link between cardiometabolic index with mortality? Evidence from a large population-based study. Cardiovasc Diabetol. 2024;23(1):212. pmid:38902748
  30. 30. Zhang Q, Xiao S, Jiao X, Shen Y. The triglyceride-glucose index is a predictor for cardiovascular and all-cause mortality in CVD patients with diabetes or pre-diabetes: evidence from NHANES 2001-2018. Cardiovasc Diabetol. 2023;22(1):279. pmid:37848879
  31. 31. Xu F, Earp JE, Adami A, Weidauer L, Greene GW. The relationship of physical activity and dietary quality and diabetes prevalence in US adults: findings from NHANES 2011-2018. Nutrients. 2022;14(16):3324. pmid:36014830
  32. 32. Liu L, Yan Y, Qiu J, Chen Q, Zhang Y, Liu Y, et al. Association between sedentary behavior and depression in US adults with chronic kidney disease: NHANES 2007-2018. BMC Psychiatry. 2023;23(1):148. pmid:36894924
  33. 33. Yu Y, Cheng S, Huang H, Deng Y, Cai C, Gu M, et al. Joint association of sedentary behavior and vitamin D status with mortality among cancer survivors. BMC Med. 2023;21(1):411. pmid:37904126
  34. 34. Chuang M-H, Wang H-W, Huang Y-T, Ho C-H, Jiang M-Y. Association of sedentary lifestyle with all-cause and cause-specific mortality in adults with reduced kidney function. Kidney360. 2024;5(1):33–43. pmid:37968801
  35. 35. Tao J, Zhang Y, Tan C, Tan W. Associations between weight-adjusted waist index and fractures: a population-based study. J Orthop Surg Res. 2023;18(1):290. pmid:37038167
  36. 36. Chen H, Luo X, Du Y, He C, Lu Y, Shi Z, et al. Association between chronic obstructive pulmonary disease and cardiovascular disease in adults aged 40 years and above: data from NHANES 2013-2018. BMC Pulm Med. 2023;23(1):318. pmid:37653498
  37. 37. Zhan Y, Yang Z, Liu Y, Zhan F, Lin S. Interaction between rheumatoid arthritis and mediterranean diet on the risk of cardiovascular disease for the middle aged and elderly from National Health and Nutrition Examination Survey (NHANES). BMC Public Health. 2023;23(1):620. pmid:37003993
  38. 38. Jiang M, Tang X, Wang P, Yang L, Du R. Association between daily alcohol consumption and serum alpha klotho levels among U.S. adults over 40 years old: a cross-sectional study. BMC Public Health. 2023;23(1):1901. pmid:37784055
  39. 39. Wu Y-Y, Lei P-C, Li L-L, Ye R-X, Wang Q-Z, Sun C, et al. The association between abdominal obesity and diabetes among middle-aged and older adults with normal BMI. Sichuan Da Xue Xue Bao Yi Xue Ban. 2021;52(2):340–4. pmid:33829712
  40. 40. Fang H, Berg E, Cheng X, Shen W. How to best assess abdominal obesity. Curr Opin Clin Nutr Metab Care. 2018;21(5):360–5. pmid:29916924
  41. 41. Glovaci D, Fan W, Wong ND. Epidemiology of diabetes mellitus and cardiovascular disease. Curr Cardiol Rep. 2019;21(4):21. pmid:30828746
  42. 42. Tutor AW, Lavie CJ, Kachur S, Milani RV, Ventura HO. Updates on obesity and the obesity paradox in cardiovascular diseases. Prog Cardiovasc Dis. 2023;78:2–10. pmid:36481212
  43. 43. Carbone S, Canada JM, Billingsley HE, Siddiqui MS, Elagizi A, Lavie CJ. Obesity paradox in cardiovascular disease: where do we stand? Vasc Health Risk Manag. 2019;15:89–100. pmid:31118651
  44. 44. Simati S, Kokkinos A, Dalamaga M, Argyrakopoulou G. Obesity paradox: fact or fiction? Curr Obes Rep. 2023;12(2):75–85. pmid:36808566
  45. 45. Gravina G, Ferrari F, Nebbiai G. The obesity paradox and diabetes. Eat Weight Disord. 2021;26(4):1057–68. pmid:32954485
  46. 46. Donini LM, Pinto A, Giusti AM, Lenzi A, Poggiogalle E. Obesity or BMI paradox? Beneath the tip of the iceberg. Front Nutr. 2020;7:53. pmid:32457915
  47. 47. Wei S, Nguyen TT, Zhang Y, Ryu D, Gariani K. Sarcopenic obesity: epidemiology, pathophysiology, cardiovascular disease, mortality, and management. Front Endocrinol (Lausanne). 2023;14:1185221. pmid:37455897
  48. 48. Flegal KM, Kit BK, Orpana H, Graubard BI. Association of all-cause mortality with overweight and obesity using standard body mass index categories: a systematic review and meta-analysis. JAMA. 2013;309(1):71–82. pmid:23280227
  49. 49. Han SJ, Boyko EJ. The Evidence for an obesity paradox in type 2 diabetes mellitus. Diabetes Metab J. 2018;42(3):179–87. pmid:29885111
  50. 50. Ding C, Shi Y, Li J, Li M, Hu L, Rao J, et al. Association of weight-adjusted-waist index with all-cause and cardiovascular mortality in China: a prospective cohort study. Nutr Metab Cardiovasc Dis. 2022;32(5):1210–7. pmid:35277327
  51. 51. Jia S, Huo X, Sun L, Yao Y, Chen X. The association between the weight-adjusted-waist index and frailty in US older adults: a cross-sectional study of NHANES 2007-2018. Front Endocrinol (Lausanne). 2024;15:1362194. pmid:39319256
  52. 52. Hu Q, Han K, Shen J, Sun W, Gao L, Gao Y. Association of weight-adjusted-waist index with non-alcoholic fatty liver disease and liver fibrosis: a cross-sectional study based on NHANES. Eur J Med Res. 2023;28(1):263. pmid:37537679
  53. 53. Huang X-T, Lv X, Jiang H. The weight-adjusted-waist index and cognitive impairment among U.S. older adults: a population-based study. Front Endocrinol (Lausanne). 2023;14:1276212. pmid:38027119
  54. 54. Gui Z, Yu L, Chen Y, Zhang M, He J, Hao Y. Study from the United States: increased prevalence of kidney stones in patients with high weight-adjusted waist index. Front Nutr. 2024;10:1171775. pmid:38299185
  55. 55. Chen D, Xie Y, Luo Q, Fan W, Liu G. Association between weight-adjusted waist index and kidney stones: a propensity score matching study. Front Endocrinol (Lausanne). 2024;15:1266761. pmid:38911038
  56. 56. Cao S, Hu X, Tang Y, Wu K, Yang W, Li X. Weight-adjusted-waist index is positively associated with urinary incontinence: results from the National Health and Nutrition Examination Survey (NHANES) 2001-2018. Eur J Med Res. 2024;29(1):368. pmid:39014459
  57. 57. Han Y, Shi J, Gao P, Zhang L, Niu X, Fu N. The weight-adjusted-waist index predicts all-cause and cardiovascular mortality in general US adults. Clinics (Sao Paulo). 2023;78:100248. pmid:37441866
  58. 58. Patterson R, McNamara E, Tainio M, de Sá TH, Smith AD, Sharp SJ, et al. Sedentary behaviour and risk of all-cause, cardiovascular and cancer mortality, and incident type 2 diabetes: a systematic review and dose response meta-analysis. Eur J Epidemiol. 2018;33(9):811–29. pmid:29589226
  59. 59. Ling Y, Tao Z, Wan Y, Cui H, Zhang Z, Pei J, et al. Associations of sedentary behavior with risks of cardiovascular disease events among Chinese adults. J Atheroscler Thromb. 2024;31(10):1398–415. pmid:38569881
  60. 60. Deng M-G, Cui H-T, Lan Y-B, Nie J-Q, Liang Y-H, Chai C. Physical activity, sedentary behavior, and the risk of type 2 diabetes: a two-sample Mendelian Randomization analysis in the European population. Front Endocrinol (Lausanne). 2022;13:964132. pmid:36407298
  61. 61. Jia H, Liu Y, Liu D. Role of leisure sedentary behavior on type 2 diabetes and glycemic homeostasis: a Mendelian randomization analysis. Front Endocrinol (Lausanne). 2023;14:1221228. pmid:38075044
  62. 62. Lin Y, Liu Q, Liu F, Huang K, Li J, Yang X, et al. Adverse associations of sedentary behavior with cancer incidence and all-cause mortality: a prospective cohort study. J Sport Health Sci. 2021;10(5):560–9. pmid:33878448
  63. 63. Biswas A, Oh PI, Faulkner GE, Bajaj RR, Silver MA, Mitchell MS, et al. Sedentary time and its association with risk for disease incidence, mortality, and hospitalization in adults: a systematic review and meta-analysis. Ann Intern Med. 2015;162(2):123–32. pmid:25599350
  64. 64. Zhu P, Lao G, Li H, Tan R, Gu J, Ran J. Replacing of sedentary behavior with physical activity and the risk of mortality in people with prediabetes and diabetes: a prospective cohort study. Int J Behav Nutr Phys Act. 2023;20(1):81. pmid:37415151
  65. 65. Katzmarzyk PT, Powell KE, Jakicic JM, Troiano RP, Piercy K, Tennant B, et al. Sedentary behavior and health: update from the 2018 physical activity guidelines advisory committee. Med Sci Sports Exerc. 2019;51(6):1227–41. pmid:31095080
  66. 66. Liang Z, Zhang M, Wang C-Z, Yuan Y, Liang J-H. Association between sedentary behavior, physical activity, and cardiovascular disease-related outcomes in adults-A meta-analysis and systematic review. Front Public Health. 2022;10:1018460. pmid:36339165
  67. 67. Vandercappellen EJ, Koster A, Savelberg HHCM, Eussen SJPM, Dagnelie PC, Schaper NC, et al. Sedentary behaviour and physical activity are associated with biomarkers of endothelial dysfunction and low-grade inflammation-relevance for (pre)diabetes: The Maastricht Study. Diabetologia. 2022;65(5):777–89. pmid:35119485
  68. 68. Dombrowski MD, Mueller PJ. Sedentary conditions and enhanced responses to GABA in the RVLM: role of the contralateral RVLM. Am J Physiol Regul Integr Comp Physiol. 2017;313(2):R158–68. pmid:28490450