Table 1.

Estimates of regression coefficients of the GAM for Hubei province.

Parameter	Estimate (95% CI)	Z-value	p-Value
Intercept, β0	38.14 (14.54–61.74)	3.17	0.002
AT, β1	−3.61 (−6.46 to −0.75)	−2.47	0.013
ARH, β2	−0.43 (−0.7 to −0.16)	−3.16	0.002
AT ×ARH, β3	0.04 (0.004–0.07)	2.18	0.029
Baidu index, β4	3.51 × 10−5 (1.96 × 10−5, 5.06 × 10−5)	4.43	<0.001
Time
β5	3.42 (−0.9, 7.74)	1.55	0.120
β6	4.96 (2.87–7.04)	4.66	<0.001