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RCS curve of the association between BRI and prevalence of infertility among all participants. It was adjusted for age, marital status and race/ethnicity, education levels, family income, BMI, regular menstrual periods, pelvic infection, female hormones taken, birth control pills taken, drinking history and smoking history. RCS, restricted cubic spline; BRI, body round index; BMI, body mass index; OR, odds ratio.
