Figure 2

Flow diagram of screening, matching and follow-up indicating losses from the original cohort of the study. ^a The preliminary screening was conducted in the antenatal clinics and re-screening in the maternity wards after birth; ^b Eligible women in the caesarean section group were matched with those who delivered vaginally (Figure 1) according to the matching criteria; ^c Post-partum investigations were made in the maternity wards, and follow-up of 1 month, 6 months and 12 months post-partum in the Maternity and Child Health Institutes affiliated to MCHs.