Table 3.

ORs for studied adverse pregnancy outcomes per 3000 vehicles/day increase at the home address

	Preterm birth			Small for gestational age			Pregnancy-induced hypertensive disorders
	n	OR	95% CI	n	OR	95% CI	n	OR	95% CI
Unadjusted model*	101 003	1.00	0.98 to 1.01	101 895	0.99	0.98 to 1.00	102 726	1.01	1.00 to 1.03
Model 2†	99 703	1.00	0.99 to 1.02	100 592	1.00	0.99 to 1.01	101 410	1.01	0.99 to 1.02
Model 3‡	75 599	1.00	0.99 to 1.02	76 185	1.00	0.99 to 1.01	76 735	1.02	1.00 to 1.03

*Includes a random effect for municipality.

†Adjusted for maternal asthma, maternal level of education, maternal area of origin, maternal age, first trimester temperature, first trimester ozone, day and year of conception, and parity.

‡Additionally adjusted for maternal smoking, body mass index and family situation.