Table 2. Summary of the model obtained for Changsha.^a .

Variable	IRR	95% CI	P
No. of cases, 3-month lag	1.003	1.002—1.003	<0.001
AH (g/m3), 5-month lag	1.472	1.423—1.523	<0.001
Precipitation (mm), 5-month lag	1.002	1.001—1.003	<0.001
MEI, 6-month lag	1.645	1.435—1.885	<0.001
Year of onset	0.910	0.904—0.916	<0.001
Moisture condition (Annual precipitation)	1.001	1.001—1.002	<0.001
Moisture condition (Annual mean absolute humidity)	1.026	1.017—1.037	<0.001

IRR, incidence rate ratio.

^aDummy variables for month were included in the final model.