Table 3.

Excess Relative Risk of Mortality per 10 μg/m³ and IQR Increases in PM_2.5 Concentration Averaged for Lag 1–2 Days Estimated by Individual-Lag Model, in Xi’an, China, 2004–2008

Mortality	Per 10 μg/m3		Per IQR
	Excess Relative Risk, %a	95% CI	Excess Relative Risk, %a	95% CI
All causes
All ages	0.20	0.07, 0.33	2.29	0.83, 3.76
0–44 years	0.23	−0.18, 0.63	2.55	−2.02, 7.33
45–64 years	0.25	−0.04, 0.53	2.80	−0.43, 6.14
≥65 years	0.18	0.03, 0.34	2.09	0.35, 3.85
Sex
Female	0.25	0.05, 0.45	2.83	0.53, 5.19
Male	0.17	0.00, 0.34	1.92	0.06, 3.83
Cardiovascular	0.27	0.08, 0.46	3.08	0.94, 5.26
Coronary	0.39	0.14, 0.65	4.48	1.53, 7.52
Respiratory	0.19	−0.20, 0.59	2.17	−2.24, 6.77

Abbreviations: CI, confidence interval; IQR, interquartile range of PM_2.5 averaged for lag 1–2 days: 103.0 μg/m³; PM_2.5, particulate matter less than 2.5 μm in aerodynamic diameter.

^aExcess relative risk is adjusted for temperature, relative humidity, day of the week, and time trend.