Types of cohabitation
		Married (%) (95% CI)	Cohabited single (%) (95% CI)	Non-cohabited single (%) (95% CI)	P-trend
PTB:
	Unadjusted	4.8 (4.8-4.9)	7.9 (6.9-8.9)	7.8 (6.9-8.8)	<0.001
	Model 2*	4.8 (4.7-4.8)	7.6 (6.7-8.6)	8.1 (7.1 -9.1)	<0.001
	Model 3†	4.7 (4.7-4.8)	6.6 (5.8-7.5)	7.1 (6.3-8.0)	<0.001
LBW:
	Unadjusted	3.8 (3.7-3.8)	6.3 (5.5-7.2)	6.7 (5.8-7.6)	<0.001
	Model 2*	3.7 (3.6-3.7)	5.9 (5.1-6.8)	6.2 (5.4-7.1)	<0.001
	Model 3†	3.6 (3.6-3.7)	5.0 (4.4-5.8)	5.4 (4.7-6.1)	<0.001
SGA:
	Unadjusted	5.4 (5.3-5.4)	7.0 (6.1-8.0)	8.8 (7.8-9.9)	<0.001
	Model 2*	4.9 (4.9-5.0)	6.3 (5.3-7.0)	6.1 (5.5-7.1)	<0.001
	Model 3†	4.9 (4.9-5.0)	5.7 (4.9-6.5)	5.9 (5.2-6.7)	0.003