Table 2.

The impacts from the changes of weather parameters on the incidence of all CO poisoning.

	Beta value	Standard error	P-value	Rate ratio*
All seasons (N = 622)
Wind speed	−0.4195	0.2400	0.0806	0.6574
Temperature	−0.0973	0.0134	<0.0001	0.9073
Relative humidity	0.1290	0.0066	0.0513	1.1377
Spring (N = 183)
Wind speed	−0.3861	0.4773	0.4188	0.6797
Temperature	0.0624	0.0383	0.1035	1.0644
Relative humidity	0.0129	0.0111	0.2461	1.0129
Summer (N = 74)
Wind speed	−0.4786	0.5390	0.3749	0.6197
Temperature	−0.0223	0.0445	0.6159	0.9779
Relative humidity	0.0363	0.0185	0.0501	1.0370
Fall (N = 93)
Wind speed	0.1178	0.3378	0.7275	1.1250
Temperature	−0.0960	0.0767	0.2112	0.9085
Relative humidity	0.0001	0.0154	0.9935	1.0001
Winter (N = 272)
Wind speed	−1.1504	0.6848	0.0936	0.3165
Temperature	−0.0785	0.0423	0.0644	1.0816
Relative humidity	0.0208	0.0147	0.1567	1.0210

^*Rate ratio is calculated by exp (beta value). Bold values are statistically significant (p-value < 0.05).