Figure 1.
Study Selection algorithm according to PRISMA guidelines.
Table 1.
Overview of studies of community sex ratios and STD risk.
Table 2.
Summary of results from included studies, focused on examining the relationship between high sex ratio communities and STD risk.
Figure 2.
Sex ratio is defined as the number of men per 100 women in populations less than 16 years old. Source: Sex Ratio: Central Intelligence Agency 2011, The World Factbook 2011, Washington DC.
Figure 3.
Potential mechanisms linking high community sex ratios and increased sexual risk behaviors.