Table 3.

Subgroup analyses of the changes of weather parameters on the incidence of intentional CO poisoning.

	Beta value	Standard error	P-value	Rate ratio*
All seasons (N = 249)
Wind speed	−0.3607	0.2420	0.1364	0.6972
Temperature	0.0084	0.0135	0.5311	1.0085
Relative humidity	0.0030	0.0072	0.6749	1.0030
Spring (N = 59)
Wind speed	−0.9221	0.7229	0.2027	0.3977
Temperature	0.1076	0.0504	0.0333	1.1136
Relative humidity	−0.0202	0.0152	0.1829	0.9800
Summer (N = 62)
Wind speed	0.0079	0.4236	0.9851	1.0079
Temperature	0.0135	0.0413	0.7440	1.0136
Relative humidity	0.0269	0.0170	0.1141	1.0272
Fall (N = 63)
Wind speed	0.3203	0.3312	0.3339	1.3775
Temperature	−0.1192	0.0802	0.1377	0.8876
Relative humidity	0.0073	0.0156	0.6404	1.0073
Winter (N = 65)
Wind speed	−0.6555	0.5510	0.2346	0.5192
Temperature	0.0245	0.0360	0.4964	1.0248
Relative humidity	0.0127	0.0133	0.3389	1.0128

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