Table 5.

Regression results for the geographical disparities in the incubation period

Variable	Model 1		Model 2		Model 3
	Coef.	p	Coef.	p	Coef.	p
Constant	13.331	0.000	13.325	0.000	9.662	0.000
Sex	0.191	0.755	−0.032	0.957	−0.047	0.933
Age	−0.297	0.000	−0.258	0.000	−0.250	0.000
Age squared	0.003	0.000	0.003	0.000	0.003	0.000
Citya			−3.313	0.000
Tempb					0.717	0.001
Temp-squaredb					−0.030	0.000
No. of obs.	217		217		217
Prob > F	0.000		0.000		0.000
R squared	0.075		0.151		0.226
Adj. R squared	0.062		0.135		0.208

^aThe baseline is Shenzhen; this variable was deleted from model 3 because of collinearity

^bAverage maximum temperature in the place where the patient first developed related symptoms