Table 6.

Unadjusted and adjusted logistic regression models of road exposures for asthma by age 5 years as outcome.

Road Exposures		Unadjusted OR (95%CI)	p-Value	Adjusted OR (95%CI) *	p-Value
Birth distance to major road, meter	<100	1.48 (0.98–2.22)	0.06	1.26 (0.81–1.95)	0.31
	100–200	1.20 (0.75–1.93)	0.44	0.95 (0.65–1.38)	0.78
	201–300	1.77 (1.11–2.82)	0.02	1.62 (0.92–2.85)	0.10
	>300	Ref	---	Ref	---
Birth distance to primary road, meter	<400	1.34 (0.54–3.30)	0.53	1.13 (0.53–2.41)	0.76
	400–1000	1.11 (0.81–1.52)	0.53	0.95 (0.64–1.39)	0.78
	>1000	Ref	---	Ref	---
Pooled distance to major road, meter †	<100	1.69 (1.09–2.61)	0.02	1.51 (1.00–2.28)	0.05
	100–200	1.17 (0.81–1.69)	0.40	0.85 (0.54–1.34)	0.49
	201–300	1.62 (1.10–2.39)	0.02	1.62 (1.16–2.25)	0.005
	>300	Ref	---	Ref	---
Pooled distance to primary road, meter †	<400	1.11 (0.33–3.71)	0.87	1.07 (0.39–2.95)	0.89
	400–1000	1.15 (0.80–1.65)	0.45	1.03 (0.69–1.55)	0.87
	>1000	Ref	---	Ref	---

Abbreviations: OR = odds ratio; CI = confidence interval; Ref = reference category. * Adjusted for sex, age at enrollment (dichotomized by age 2 months), race/ethnicity, health insurance type, preterm birth (with cut-off at 37 months), median household income estimated by ZIP code at enrollment, parental history of asthma, population density of residential area at birth, and infant tobacco exposure at enrollment, and clustering by site. † Pooled estimates derived by weighting exposures according to duration spent each address up to age three or time outcome occurred, whichever happened first.