Figure 1.
Selection of the childbirth cohort from the Black Women's Health Study, 1995–2011. Missing data on prepregnancy body mass index, in most instances, occurred because the woman was pregnant when completing the previous questionnaire.
Selection of the childbirth cohort from the Black Women's Health Study, 1995–2011. Missing data on prepregnancy body mass index, in most instances, occurred because the woman was pregnant when completing the previous questionnaire.