TOLAC and VBAC rates
The study sample size ranged from 34 to 10,718 women, with a total of 32,070 births included in this review. The weighted median TOLAC rate was 75% (IQR 40-75%) and ranged from 21.9% to 100%. The overall median VBAC rate was 34% (IQR 24-40%) and ranged from 3.4% to 85%.
Thirty-one studies included women with only one prior caesarean, comprising 26, 482 births. Among this group, the overall weighted median TOLAC rate was 75% (IQR: 40-75%), range: 21.9-100%), and median VBAC rate 34% (IQR 24-34%), ranging from 14.2-84.7%. In studies conducted before and after 1996, overall weighted median TOLAC rates were 63% and 75% (p=0.41) and median VBAC rates were 52% and 34%, respectively (p=0.14).
There were 18 comparative studies, i.e., where management with TOLAC was compared to ERCS, comprising 22,938 deliveries. Study details and delivery outcomes are summarised in Table 1. The overall weighted median TOLAC rate in this subset was 75% (IQR 39-75%), ranging from 21.9% to 98.2%, and the median VBAC rate was 34% (IQR 24-34%), ranging from 3.4 to 84%.