CHFLSChinese Health and Family Life Survey (University of Chicago/National Opinion Research Center)
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The analytic sample consisted of 1,023 nonmigrant male CHFLS respondents aged 20-44, most of whom provided a urine sample for STI testing To standardize the data for men born in different decades, and to restrict the sex ratio calculations to individuals of similar age, the researchers calculated the community-level sex ratio as the ratio of women aged 15-21 to men aged 17-23 in each respondent's community when lie was 20 years old.