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Table 4 Descriptive and logistic regression analysis regarding secondary outcome variables. Values of odds ratios are presented as crude estimates as well as after adjustment

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

Secondary outcome variables p-value    Crude OR 95% CI Adjusted OR 95% CI
Total number of caesarean deliveries a (p < 0.01) No Yes     
 BMI < 25   1047 (84.0%) 199 (16.0%) 1   1  
 BMI 25–29.9   258 (73.7%) 92 (26.3%) 1.88 [1.42–2.49] 1.62 [1.18–2.22]
 BMI ≥ 30   141 (69.5%) 62 (30.5%) 2.31 [1.66–3.23] 1.76 [1.20–2.58]
Caesarean prior to onset of active labor a (p < 0.01) No Yes     
 BMI < 25   22 (1.8%) 1211 (98.2%) 1   1  
 BMI 25–29.9   19 (5.4%) 331 (94.6%) 1.99 [1.12–3.52] 1.64 [0.90–2.98]
 BMI ≥ 30   18 (8.9%) 185 (91.1%) 3.37 [1.87–6.07] 2.75 [1.47–5.16]
Reached 2nd stage of labour a (p < 0.01) No Yes     
 BMI < 25   134 (10.8%) 1112 (89.2%) 1   1  
 BMI 25–29.9   66 (18.9%) 284 (81.1%) 1.85 [1.38–2.48] 0.61 [0.45–0.84]
 BMI ≥ 30   48 (23.6%) 155 (76.4%) 2.13 [1.50–3.03] 0.59 [0.40–0.85]
Vacuum delivery b (p = 0.39) No Yes     
 BMI < 25   1068 (85.7%) 178 (14.3%) 1   1  
 BMI 25–29.9   304 (86.9%) 46 (13.1%) 0.91 [0.64–1.27] 0.83 [0.58–1.18]
 BMI ≥ 30   181 (89.2%) 22 (10.8%) 0.73 [0.46–1.17] 0.65 [0.40–1.06]
Post-partum haemorrhage ≥ 1000 mL c (p = 0.02) No Yes     
 BMI < 25   1176 (89.1%) 70 (10.9%) 1   1  
 BMI 25–29.9   325 (92.9%) 25 (7.1%) 1.29 [0.81–2.07] 1.04 [0.64–1.70]
 BMI ≥ 30   181 (89.2%) 22 (10.8%) 2.04 [1.23–3.38] 1.54 [0.90–2.61]
Arterial cord pH < 7.05 d (p = 0.04) No Yes     
 BMI < 25   1128 (98.4%) 18 (1.6%) 1    
 BMI 25–29.9   323 (97.9%) 7 (2.1%) 1.36 [0.56–3.28]   
 BMI ≥ 30   187 (95.7%) 8 (4.3%) 2.85 [1.22–6.65]   
  1. aAdjustments made for: Age, height, birthweight, labour induction, epidural analgesia and use of oxytocin during labour
  2. bAdjustments made for: Age and use of oxytocin during labour
  3. cAdjustments made for: Birthweight, epidural analgesia and caesarean delivery
  4. dNo Adjustments were made