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Table 1 Comparison by three groups of mode of delivery groups for the second twin: elective cesarean section ECS, unplanned cesarean section UPC and vaginal delivery VD

From: Delivery of the second twin: influence of presentation on neonatal outcome, a case controlled study

  planned C-section (ECS) n = 277 Unplanned C-Section (UPC) n = 233 Vaginal delivery (VD) n = 207 P-values (ECS vs. UPC, ECS vs. VD, UPC vs. VD)
Age of the mother (years) 32 ± 5.0 31.5 ± 5.7 31.4 ± 4.9 ns. (p = 0.43)
Gestational age (weeks) 35.8 ± 1.6 35.0 ± 1.9 36.2 ± 1.7 < 0.001, 0.012, < 0.001
Parity n 1.6 ± 0.9 1.5 ± 0.9 2.0 ± 1.0 0.82, < 0.001, < 0.001
Gender m/f (%) 118/159 (42.6/53.4) 110/123 (47.2/52.8) 100/107 (48.3/51.7) ns.
Chorionicity M/D (%) 64/211 (23.1/76.9) 49/183 (21.0/79.0) 44/137 (21.2/78.8) ns.
Previous C-section 18 (6,5%) 9 (3.9%) 0  
Presentation:
 Vertex 142 (51.3%) 125 (53.6%) 153 (73.9%) < 0.001
 Breech 75 (27.1%) 59 (25.3%) 54 (26.1%)
 Transverse 51 (18.4%) 45 (19.3%)  
 Not applicable 9 4  
Lung maturation 55 (19.9%) 35 (15.0%) 16 (7.7%) 0.001
Induction of labor 4 (1.4%) 40 (17.2%) 99 (47.8%) < 0.001
  1. Continuous data are given by mean and+/− standard deviation