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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