Table 2.

Adjusted odds ratios for negative birth outcomes by type of labour

	IOL at 40 GW (40 + 0 to 40 + 6) N = 456		IOL at 41 GW (41 + 0 to 41 + 6) N = 318		SOL (40 + 0 to 41 + 6) N = 1585
	Adj OR (95% CI)	p value	Adj OR (95% CI)	p value
Any negative outcome	2.21 (1.75–2.77)	< 0.001	1.91 (1.47–2.48)	< 0.001	Ref
All maternal complications	2.18 (1.71–2.77)	< 0.001	2.34 (1.78–3.07)	< 0.001	Ref
Caesarean section	2.75 (2.07–3.65)	< 0.001	3.01 (2.21–4.12)	< 0.001	Ref
Operative vaginal delivery	1.27 (0.82–1.98)	0.285	0.48 (0.24–0.97)	0.041	Ref
Other maternal complications	0.88 (0.55–1.42)	0.606	1.83 (1.19–2.80)	0.006	Ref
All neonatal complications	1.63 (1.24–2.14)	< 0.001	1.16 (0.83–1.62)	0.370	Ref

Abbreviations: GW Gestational weeks, IOL Induction of labour, Ref Reference group, SOL Spontaneous onset of labour

ORs are adjusted for age, parity, education, BMI and neonatal weight