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Table 3 Unadjusted and adjusted odds ratios (OR) for caesarean section by onset of labour and maternal and infant characteristics

From: Induction of twin pregnancy and the risk of caesarean delivery: a cohort study

Characteristics

Total number

CAESAREAN SECTION

N

Unadjusted OR (95 % CI)

Adjusted1 OR (95 % CI)

Labour onset

    

Spontaneous

242

30

reference

reference

Induction

220

47

1.9 (1.1-3.2)

1.9 (1.1-3.5)

Parity

    

≥1

265

13

reference

reference

0

197

64

9.3 (4.9-17.5)

14 (6.8-29)

Age (years)

    

<35

343

56

reference

reference

≥35

119

21

1.1 (0.6-1.9)

1.9 (1.1-3.7)

Gestational length (weeks)

    

<36

91

15

1.2 (0.6-2.4)

1.2 (0.5-3.1)

36-38

279

24

reference

reference

>38

92

38

2.2 (1.2-3.9)

1.8 (0.9-3.9)

Complication to the pregnancy

    

No

316

46

reference

reference

Yes

146

28

1.6 (0.9-2.6)

1.1 (0.6-1.8)

Birth weight 1st twin (g)

    

<2474

115

21

1.3 (0.7-2.3)

1.1 (0.5-2.3)

2474-3050

235

35

reference

reference

>3050

112

21

1.3 (0.7–2.4)

1.7 (0.8-3.6)

Birth weight 2nd twin (g)

    

<2449

115

21

1.2 (0.7-2.3)

1.1 (0.5-2.6)

2449-3075

233

34

reference

reference

>3075

114

23

1.5 (0.8-2.6)

1.6 (0.8-3.4)

  1. 1Adjusted for maternal age, gestational length, parity, complications to the pregnancy, weight of first twin (percentiles) and year of birth