. Author manuscript; available in PMC: 2021 May 26.

Published in final edited form as: Ecotoxicol Environ Saf. 2021 Feb 24;213:112063. doi: 10.1016/j.ecoenv.2021.112063

Table 2.

Adjusted hazard ratio (95% CI) of stroke mortality associated with each 10 μg/m³ increase in PM_2.5 levels.

Items	Number	Hazard Ratio (95%CI)	p-value
Death cases of stroke	254
Follow-up (person-years)	375,876
Model 1^a		1.27 (1.01–1.60)	0.044
Model 2^b		1.29 (1.02–1.63)	0.031
Model 3^c		1.31 (1.04–1.64)	0.023
Model 4^d		1.31 (1.04–1.65)	0.020

Model 1: adjusted for age and sex.

Model 2: Model 1 + adjusted for education and personal monthly income (< 500 Yuan vs ≥ 500 Yuan).

Model 3: Model 2 + adjusted for BMI, smoke (yes vs no), drink (yes vs no), and physical activity (inactive vs active).

Model 4: Model 3 + adjusted for history of hypertension (yes vs no) and diabetes (yes vs no).