Table 3.

Univariable 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
PM2.5 (per 10 µg/m3)
Lag0 day	1.18 (1.08 to 1.32)	<0.001	1.01 (0.94 to 1.09)	0.75
Lag1 day	1.29 (1.15 to 1.42)	<0.001	1.07 (1.00 to 1.14)	0.06
Lag2 day	1.24 (1.12 to 1.38)	<0.001	1.03 (0.96 to 1.10)	0.47
Lag3 day	1.13 (1.01 to 1.26)	0.005	0.98 (0.91 to 1.05)	0.58
Lag4 day	1.16 (1.03 to 1.29)	0.013	1.01 (0.94 to 1.08)	0.85
Lag5 day	1.17 (1.07 to 1.29)	0.001	1.01 (0.94 to 1.09)	0.70
Lag1-3 day average	1.27 (1.14 to 1.44)	<0.001	1.02 (0.94 to 1.10)	0.67
Temperature (per 10°C)
Lag0 day	0.63 (0.56 to 0.70)	<0.001	0.83 (0.76 to 0.90)	<0.001
Lag1 day	0.67 (0.58 to 0.76)	<0.001	0.84 (0.77 to 0.91)	<0.001
Lag2 day	0.64 (0.57 to 0.72)	<0.001	0.81 (0.75 to 0.88)	<0.001
Lag3 day	0.64 (0.56 to 0.73)	<0.001	0.82 (0.75 to 0.89)	<0.001
Lag4 day	0.60 (0.52 to 0.68)	<0.001	0.80 (0.74 to 0.87)	<0.001
Lag5 day	0.64 (0.56 to 0.73)	<0.001	0.84 (0.77 to 0.91)	<0.001
Lag1–3 day average	0.62 (0.54 to 0.71)	<0.001	0.81 (0.74 to 0.88)	<0.001
Relative humidity (per 10%)
Lag0 day	1.02 (0.97 to 1.07)	0.49	1.11 (1.07 to 1.14)	<0.001
Lag1 day	1.01 (0.96 to 1.06)	0.69	1.09 (1.06, 1.13)	<0.001
Lag2 day	1.03 (0.98 to 1.09)	0.09	1.10 (1.07 to 1.14)	<0.001
Lag3 day	1.07 (1.02 to 1.12)	0.005	1.14 (1.10 to 1.18)	<0.001
Lag4 day	1.04 (0.99 to 1.08)	0.17	1.09 (1.06 to 1.13)	<0.001
Lag5 day	1.04 (1.00 to 1.09)	0.05	1.10 (1.07 to 1.13)	<0.001
Lag1–3 day average	1.06 (1.01 to 1.13)	0.064	1.17 (1.13 to 1.22)	<0.001
Influenza epidemic (yes vs no)	1.12 (1.02 to 1.24)	0.014	1.14 (1.01 to 1.29)	0.003