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Table 1 Distribution of covariates at baseline among women in different body mass index groups

From: Maternal obesity and its effect on labour duration in nulliparous women: a retrospective observational cohort study

  Maternal BMI a:
<25 25–29.9 ≥30
Covariates p-value (n = 1246; 66.1%) (n = 350; 18.6%) (n = 203; 10.8%)
Maternal age p = 0.92  
 < 25   317 (25.4%) 86 (24.6%) 54 (26.6%)
 25–30   429 (34.4%) 126 (36.0%) 74 (36.4%)
 30–35   376 (30.2%) 100 (28.5%) 59 (29.1%)
 > 35   124 (10.0%) 38 (10.9%) 16 (7.9%)
Height p = 0.75  
 < 160 cm   124 (10.0%) 36 (10.3%) 15 (7.4%)
 160-169 cm   595 (47.7%) 178 (50.9%) 106 (52.2%)
 170–179 cm   477 (38.3%) 124 (35.4%) 73 (36.0%)
 ≥ 180 cm   50 (4.0%) 12 (3.4%) 9 (4.4%)
Hypertensive disease p < 0.01  
 No   1132 (90.9%) 271 (77.4%) 158 (77.8%)
 Yes   114 (9.1%) 79 (22.6%) 45 (22.2%)
Gestational Diabetes p < 0.01  
 No   1218 (97.8%) 335 (95.7%) 188 (92.6%)
 Yes   28 (2.2%) 15 (4.3%) 15 (7.4%)
Gestational age p = 0.27  
 37–38 weeks   173 (13.9%) 46 (13.1%) 36 (17.7%)
 39–40 weeks   635 (51.0%) 180 (51.4%) 98 (48.3%)
 ≥ 41 weeks   438 (35.1%) 124 (35.5%) 69 (34.0%)
Labour Induced p < 0.01  
 Yes   363 (29.1%) 131 (37.4%) 98 (48.3%)
 No   831 (70.9%) 219 (62.6%) 105 (51.7%)
CTG p < 0.01  
 Yes   906 (72.7%) 285 (81.4%) 176 (86.7%)
 No   340 (27.3%) 65 (18.6%) 27 (13.3%)
Oxytocin p = 0.03  
 Yes   744 (59.7%) 232 (66.3%) 135 (66.5%)
 No   502 (40.3%) 118 (33.7%) 68 (33.5%)
Epidural analgesia p < 0.01    
 Yes   501 (40.2%) 170 (48.6%) 114 (56.2%)
 No   745 (59.8%) 180 (51.4%) 89 (43.8%)
Birthweight p < 0.01    
 <3.0 kg   187 (15.0%) 41 (11.7%) 11 (5.5%)
 3.0–3.5 kg   439 (35.3%) 111 (31.8%) 80 (39.8%)
 3.5–4.0 kg   456 (36.7%) 141 (40.4%) 69 (34.3%)
 >4.0 kg   162 (13.0%) 56 (16.1%) 41 (20.4%)
  1. Values are numbers (percentages)
  2. 86 women (4.5%) did not have BMI recorded and were therefore not accounted for in analysis