表 1. Results of Cox proportional hazards regression analysis (n = 9603).

Cox回归分析结果表（n=9603）

Exposure	IQR/(µg/m3)	Model 1a				Model 2b				Model 3c
		HR	95% CI	P		HR	95% CI	P		HR	95% CI	P
PM2.5: particulate matter with a ≤ 2.5 μm aerodynamic diameter; BC: black carbon; OM: organic matter; SO42－: sulphate; NO3－: nitrate; NH4+: ammonium; IQR: interquartile range; HR: hazard ratio. a Model 1 is adjusted for sex, age, temperature, and relative humidity; b Model 2 is controlled for the same risk factors as Model 1 with the addition of residence, marital status, educational attainment, medical insurance, employment status, and income group; c Model 3 includes all covariates in Model 2, with the addition of smoking and drinking behaviors.
PM2.5	31.472	1.040	0.960-1.127	0.338		1.109	1.023-1.203	0.012		1.100	1.015-1.193	0.020
BC	1.227	1.081	0.995-1.174	0.066		1.140	1.049-1.238	0.002		1.131	1.041-1.229	0.004
OM	6.574	1.092	1.009-1.181	0.029		1.150	1.063-1.245	< 0.001		1.142	1.055-1.236	0.001
SO42-	5.818	1.024	0.939-1.118	0.590		1.097	1.005-1.197	0.038		1.088	0.996-1.187	0.060
NO3-	8.460	1.020	0.941-1.106	0.628		1.089	1.004-1.181	0.039		1.081	0.996-1.172	0.062
NH4+	5.273	1.040	0.956-1.130	0.364		1.107	1.018-1.204	0.017		1.098	1.010-1.194	0.029