Of the 789 women who met the BMI threshold for eligibility assessment, 420 (65%) who passed the screening declined to participate. Of those who consented to participation, an additional 137 women either withdrew consent or failed further screening, leaving 50 women who were randomized to the Pfannenstiel arm and 41 who were randomized to the vertical incision arm.
Baseline characteristics were similar between groups, with a mean maternal age of 30 years in the Pfannenstiel group and 28 years in the vertical incision group. Gestational age at delivery was a mean of 37 weeks in both groups, and mean BMI was 48-50 kg/m2.
Most patients (80%-90%) had public insurance. Diabetes was more common in the Pfannenstiel group (48%) than in the vertical incision cohort (32%). Just over 40% of patients were African American.
Two women in the Pfannenstiel group and three in the vertical incision group did not receive the intended incision. After accounting for patients lost to follow-up by 6 weeks, 43 women who received Pfannenstiel and 38 women who received vertical incisions were available for full evaluation.