TABLE IV.

Endotoxin exposure at age 2 to 3 months and wheezing between ages 1 and 7 years

	Wheezing between ages 1 and 7 years Hazard ratio, 95% CI, P value
		Atopy or atopic diseases at age 7 years*
	All children†‡	Yes†§	No†∥
Each quartile increment in endotoxin levels (EU/mg)	1.23 (1.07-1.43), .004	1.23 (1.02-1.49), .03	1.23 (1.0-1.51), .05

^*Sensitization to at least 1 allergen or physician-diagnosed allergic rhinitis or physician-diagnosed eczema by age 7 years.

^†All multivariate models were adjusted for sex and household income.

^‡Also adjusted for maternal age at delivery, gestational age, and exposure to other children in the first year of life (day care attendance or having 2 older siblings at home).

^§Also adjusted for exposure to other children in the first year of life.

^∥Also adjusted for maternal age at delivery.