Table 3.

Environmental factors for asthma symptoms by univariate analyses.

Environmental factors	Ever asthma		Current asthma
	OR (95% CI)	p	OR (95% CI)	p
Smoking exposure at home	1.19 (1.02, 1.39)	0.024	1.24 (1.04, 1.47)	0.018
Pets at home	1.33 (1.12, 1.58)	0.001	1.33 (1.09, 1.63)	0.005
Pets at home (1st year)	1.32 (1.08, 1.60)	0.006	1.42 (1.14, 1.78)	0.002
Dampness or mildew	1.90 (1.51, 2.40)	<0.001	2.10 (1.62, 2.71)	<0.001
Infrequent house cleaning
Everyday	1.00		1.00
Twice/week	1.16 (0.98, 1.39)	0.089	1.10 (0.89, 1.35)	0.368
Once/week	1.31 (1.09, 1.57)	0.004	1.26 (1.02, 1.56)	0.032
Once/two week	1.59 (1.09, 2.32)	0.015	1.46 (0.95, 2.27)	0.087
Once/month	1.44 (0.90, 2.32)	0.133	1.90 (1.16, 3.12)	0.011
< Once/month	1.43 (0.80, 2.53)	0.224	1.46 (0.76, 2.78)	0.256
Truck traffic in residential streets
Never	1.00		1.00
Occasionally	1.43 (1.19, 1.72)	<0.001	1.24 (1.01, 1.52)	0.044
Frequently	1.85 (1.43, 2.39)	<0.001	1.75 (1.31, 2.33)	<0.001
Almost always	1.62 (1.13, 2.32)	0.008	1.59 (1.07, 2.38)	0.023
Heating
Electric heating	0.92 (0.78, 1.09)	0.330	0.96 (0.80, 1.17)	0.707
Floor heating system	1.42 (1.16, 1.74)	0.001	1.32 (1.04, 1.68)	0.022
Cooking
Electric cooking	1.15 (0.97, 1.36)	0.119	1.05 (0.86, 1.29)	0.633
Gas cooking	0.93 (0.76, 1.14)	0.486	0.96 (0.76, 1.21)	0.722
Floor
Solid wood flooring	0.86 (0.75, 1.00)	0.045	0.89 (0.75, 1.05)	0.176
Laminated flooring	1.23(1.06, 1.44)	0.007	1.17 (0.98, 1.40)	0.077
Wall
Emulsion paint	1.18 (1.03, 1.35)	0.018	1.04 (0.89, 1,22)	0.610
Wallpaper	0.99 (0.84, 1.16)	0.877	1.04 (0.86, 1.25)	0.710

OR, odds ratio; CI, confidence interval; 1st year, in the first year of life. Bold font means statistical significance (p < 0.05).