Table 6.

Association (adjusted odds ratios and 95% confidence interval) between exposure and allergic rhinitis among children (n = 388), stratified by significant covariates

	n	Effect per 20 μg/m3 of PM10	Effect per 18 μg/m3 of NO2
		aOR (95% CI), p-valuea	aOR (95% CI), p-valuea
Stressful family events
No	258	0.93 (0.63, 1.22)	0.94 (0.73, 1.84)
Yes	130	1.76 (1.10, 3.11)*, 0.028	1.94 (1.18, 3.20)**, 0.009
Parental history of allergy
No	205	0.80 (0.61, 1.08)	1.09 (0.63, 1.23)
Yes	83	1.08 (0.95, 1.34), 0.113	1.46 (1.00, 2.26), 0.084
Eczema during the first year
No	198	0.76 (0.49, 1.20)	0.91(0.28, 1.85)
Yes	190	0.91 (0.55, 1.52), 0.121	1.05 (0.69, 1.60), 0.098
Gender
Girls	171	0.95 (0.53, 1.36)	1.42 (0.92, 2.10)
Boys	217	1.46 (1.13, 2.08)*, 0.039	2.13 (1.31, 3.45)**, 0.004

OR (95% CI) was estimated for an IQR increase in PM₁₀, SO₂, NO₂, CO, and O₃

*p < 0.05

**p < 0.01

Adjustment for all the potential covariates in Table 2 including personal factors (sex, birth weight, delivery, feeding, eczema, parental allergy, and stress) and indoor factors (tobacco smoke, new furniture, pets, house redecoration) except for the stratification variables

^ap-value of likelihood ratio test comparing model fit with and without inclusion of interaction terms