Relationship between Air Pollution and Hospital Admissions for Chronic Obstructive Pulmonary Disease in Changchun, China: A Season-Stratified Case-Cross Study

Table 3

Multifactorial models to assess the relationship between hospital admissions of COPD and concentrations of air pollutants in different seasons.

Season	Air pollutants	B	SE	Wald		OR (95%CI)
Spring	SO2	−0.008	0.003	7.077	0.008	0.992 (0.986–0.998)
	NO2	0.009	0.004	5.557	0.018	1.009 (1.002–1.017)
Autumn	PM2.5	0.005	0.003	4.362	0.037	1.005 (1.000–1.011)
	PM10	−0.005	0.002	4.302	0.038	0.995 (0.991–1.000)
	SO2	0.006	0.006	5.219	0.022	1.006 (1.001–1.011)
Winter	PM2.5	0.008	0.003	5.871	0.015	1.008 (1.002–1.015)
	PM10	−0.006	0.003	4.892	0.027	0.994 (0.988–0.999)

After adjusting the meteorological factor.