Subjects were allowed to BIG VAGINA AFRICA more than one race but were asked to select a primary racial category if more than one race was indicated. The angle of the posterior rectal wall relative to the pubococcygeal line was measured at rest and during Valsalva. Also, in the vaginal delivery cohort, the M line with straining was shorter among white women 2. The MRI protocol was standardized at a 1-day training session, led by the expert consulting radiologist at the central site before study initiation. Such infections generally occur later in life through sexual activity. Another possibility is that the increased H Line and M Line in African-American women are a soft tissue consequence of the bony pelvis differences by BIG VAGINA AFRICA, namely a longer anteroposterior diameter of the outlet in African-American women.