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Table 4 Relative risk ratios for caesarean section in “standard primiparae” who experienced labour

From: Caesarean section following induction of labour in uncomplicated first births- a population-based cross-sectional analysis of 42,950 births

  RRR 95 % CI aRRRb 95 % CI p-value
Type of labour      
 Spontaneous 1 ref gpa 1 ref gpa  
 Aug amniotomy 1.76 (1.6, 1.9) 1.48 (1.3, 1.6) <0.0001
 Aug oxytocin 6.17 (5.7, 6.7) 2.89 (2.6, 3.2) <0.0001
 Aug amniotomy & oxytocin 6.51 (5.9, 7.2) 2.55 (2.3, 2.8) <0.0001
 IOL PG 5.84 (5.0, 6.9) 3.86 (3.2, 4.6) <0.0001
 IOL amniotomy 3.08 (1.8, 5.2) 2.73 (1.6, 4.7) <0.0001
 IOL oxytocin 7.37 (4.4, 12.2) 4.13 (2.4, 7.0) <0.0001
 IOL PG & amniotomy 5.05 (3.9, 6.5) 2.78 (2.1, 3.6) <0.0001
 IOL PG & oxytocin 11.83 (8.4, 16.6) 4.06 (2.8, 5.8) <0.0001
 IOL amniotomy & oxytocin 3.86 (3.3, 4.6) 1.82 (1.5, 2.2) <0.0001
 IOL PG&amniotomy&oxytocin 10.19 (8.8, 11.9) 3.79 (3.2, 4.5) <0.0001
Mother’s age in years      
 per year older 1.132 (1.12, 1.14) 1.088 (1.08, 1.10) <0.0001
Epidural analgesia in labour      
 No 1 ref gpa 1 ref gpa  
 Yes 4.47 (4.2, 4.7) 5.68 (5.3, 6.1) <0.0001
Birthweight      
 per 100 g increase 1.086 (1.08, 1.1) 1.101 (1.09, 1.11) <0.0001
Gestation (completed weeks)      
 37 0.72 (0.6, 0.8) 0.94 (0.8, 1.1) 0.523
 38 1.31 (1.2, 1.4) 0.85 (0.8, 0.95) 0.005
 39 0.87 (0.8, 0.9) 0.83 (0.8, 0.9) <0.0001
 40 1 ref gpa 1 ref gpa  
Admission status of mother      
 Public 1 ref gpa 1 ref gpa  
 Private 2.47 (2.3, 2.6) 1.11 (1.03, 1.2) 0.003
  1. Aug augmented, IOL induction of labour, PG prostaglandins
  2. a ref gp = reference group
  3. b Relative Risk Ratios after adjustment for all other variables in the table