Table 3.

Comparison of the prevalence of asthma-like symptoms and asthma and outcome of logistic regression analysis in Zunyi in winter vs. summer

Risk factors	Winter				Summer
	Prevalence of asthma-like symptoms and asthma
	B	Standard Error	OR (95%CI)	P value	B	Standard Error	OR (95%CI)	p value
Constant	−13.655	1.785	0.000	<0.001***	−8.255	1.511	0.000	<0.001***
Age, years	0.029	0.014	1.030 (1.003,1.058)	0.030*	0.031	0.013	1.032 (1.006,1.05)	0.016*
BMI	0.548	0.226	1.730 (1.111,2.693)	0.015*	0.262	0.253	1.299 (0.791,2.135)	0.301
Asthma and asthma-related symptoms in childhood	2.505	0.391	12.239 (5.690,26.329)	<0.001***	1.928	0.424	6.877 (2.994,15.767)	<0.001***
Familial history of asthma-like symptoms and asthma	0.897	0.361	2.452 (1.209,4.971)	0.013*	0.660	0.410	1.934 (0.866,4.319)	0.107
Kitchen location	0.714	0.923	2.042 (0.334,12.478)	0.439	2.176	0.812	8.807 (1.794,43.241)	0.007**
Stove used for cooking or warming	0.608	0.217	1.836 (1.200,2.810)	0.005**	0.841	0.276	2.318 (1.349,3.982)	0.002**
Cooking oil fumes	0.973	0.384	2.646 (1.247,5.613)	0.011*	2.070	0.581	7.926 (2.538,24.753)	<0.001***
Keep pets	1.087	0.403	2.966 (1.347,6.527)	0.007**	−0.858	0.654	0.424 (0.118,1.526)	0.189
Smoking status	0.984	0.240	2.675 (1.670,4.284)	<0.001***	0.436	0.236	1.546 (0.973,2.457)	0.065*
Second-hand smoke	1.377	0.401	3.963 (1.807,8.691)	<0.001***	1.082	0.483	2.950 (1.144,7.607)	0.025*
Mattress use history	–	–	–	–	−1.270	0.354	0.281 (0.140,0.562)	<0.001***
Mold in bedroom	–	–	–	–	2.041	0.713	7.696 (1.903,31.127)	0.004**

Logistic regression, α = 0.05, *significant at p < 0.05, **significant at p < 0.01, *** significant at p < 0.001