Table 4

Multivariable Poisson regression of environmental factors with heart failure incidence and readmissions

	Heart failure incidence		All-cause readmissions
	Risk ratio	P values	Risk ratio	P values
PM_2.5 lag_1–3 day (per 10 µg/m³)	1.10 (1.01–1.22)	0.039	0.96 (0.89–1.04)	0.44
Temperature lag_1–3 day (per 10°C)	0.69 (0.59–0.81)	<0.001	0.88 (0.78–0.96)	0.009
Relative humidity lag_1–3 day (per 10%)	0.98 (0.92–1.05)	0.56	1.10 (1.05–1.15)	0.001
Influenza epidemic (yes vs no)	1.01 (0.80–1.21)	0.45	1.20 (1.06–1.38)	0.005

Further adjusted for weekday and weekend, school and public holiday and time trend.