Types of cohabitation
	Maternal age (years)	Married (%) (95% CI)	Cohabited single (%) (95% CI)	Non-cohabited single (%) (95% CI)	P-trend
PTB:
	<20	6.1 (5.2-7.1)	8.9 (5.5-14.1)	9.0 (6.3-12.6)	0.31
	20-34	4.5 (4.4-4.5)	7.6 (6.4-9.0)*	7.2 (6.2-8.4)*	<0.001
	≥35	5.9 (5.8-6.0)	8.0 (6.5-9.7)‡	8.7 (6.7-11.3)‡	<0.001
LBW:
	<20	4.8 (4.0-5.7)	8.0 (4.8-12.9)	5.8 (3.7-8.9)	0.66
	20-34	3.4 (3.4-3.5)	6.1 (5.0-7.4)*	6.8 (5.8-7.9)*	<0.001
	≥35	4.9 (4.7-4.9)	6.2 (4.9-7.8)‡	6.9 (5.1-9.2)	0.02
SGA:
	<20	5.7 (5.0-6.6)	7.8 (4.7-12.5)	10.9 (7.8-14.9)	0.31
	20-34	4.8 (4.8-4.9)	7.0 (5.8-8.4)‡	8.6 (7.4-9.9)‡	<0.001
	≥35	5.2 (5.0-5.3)	5.8 (4.5-7.4)	6.8 (4.9-9.2)	0.93