Table 5 Risk difference and relative risk (RR) with 95 % confidence interval (CI) of adverse maternal and neonatal outcomes after elective caesarean section (CS) compared with planned vaginal delivery (remaining deliveries). Shown for a low-risk population of primiparous women ≥ 35 years when delivering singletons in cephalic version at term (≥37 gestational weeks) Norway, 1999 − 2009, n = 10,999

373

10,626

%

%

%

Risk difference %

P-value^a

RR_c (95 % CI)

RR_adj ^b (95 % CI)

18.3

27.6

17.9

9.7

0.000

1.54 (1.30-1.82)

1.83 (1.49-2.26)

1.8

2.1

1.8

0.3

0.611

1.20 (0.60-2.42)

1.43 (0.69-2.93)

0.2

0.3

0.2

0.1

0.898

1.14 (0.15-8.39)

0.69 (0.08-5.58)

1.8

0.3

1.9

-1.6

0.025

0.14 (0.02-1.01)

0.17 (0.02-1.20)

0.5

0.0

0.5

-0.5

0.153

7.3

4.3

7.4

-3.1

0.020

0.59 (0.36-0.96)

0.61 (0.37-0.99)

2.2

1.3

2.2

0.266

0.61 (0.25-1.47)

0.70 (0.29-1.70)

1.0

0.3

1.1

-0.9

0.136

0.25 (0.04-1.80)

0.38 (0.05-2.78)

3.6

1.1

3.7

-2.6

0.007

0.29 (0.11-0.76

0.31 (0.12-0.84)