Exclusion criteria
UMB N (262) BCM N (295) Total N (557)
Triplet gestation 16 (6.1%) 17 (5.8%) 33 (5.9%)
Cerclage placement 9 (3.4%) 13 (4.4%) 22 (3.9%)
Dual twin demise 8 (3.0%) 10 (3.4%) 18 (3.2%)
Indicated delivery < 32 weeks 20 (7.6%) 19 (7.2%) 39 (7%)
Missing data 18 (6.8%) 16 (5.4%) 34 (6.1%)
Total n 71 (27%) 75 (25.4%) 146 (26.2%)
Data are given as n (%) UMB: University of Maryland, Baltimore; BCM: Baylor College of Medicine Data are given as n (%) UMB: University of Maryland, Baltimore; BCM: Baylor College of Medicine Data are given as n (%) UMB: University of Maryland, Baltimore; BCM: Baylor College of Medicine Data are given as n (%) UMB: University of Maryland, Baltimore; BCM: Baylor College of Medicine