Table 2.

Conditional logistic regression for risk factors for acute asthma

	Crude ORa	95% CI	p value	Adjusted ORb	95% CI	p value
Bronchiolitis	19.6	6.00–64.1	<0.001	38.9	3.26–465	0.004
Parental asthma	2.68	1.34–5.35	0.005	4.88	0.83–28.8	0.080
Atopy (sIgE)	6.06	2.65–13.9	<0.001	36.7	4.00–337	0.001
Carpeting 1st year	5.94	1.92–18.3	0.002	0.21	0.01–3.08	0.255
Air conditioning 1st year	8.00	0.89–71.6	0.063
Current contact with pets	0.22	0.09–0.53	0.001	0.07	0.01–0.56	0.012
Parental school years	1.17	1.09–1.26	<0.001	1.26	1.08–1.46	0.003
Monthly income	1.00	1.00–1.00	0.064

OR, odds ratio; CI, confidence interval. Atopy is defined as any asIgE>0.70 kU/l.

^aCrude odds ratios were calculated by conditional logistic regression (matching variables – age and sex).

^bAdjusted odds ratios were adjusted for all other variables in the model.