Table 1.

The descriptive statistics of variables.

Variables	Observations	Mean	Standard	Min	Max
Morbidity	527	5.495	0.357	4.513	6.604
Mortality	527	0.609	0.382	0.068	2.122
Population urbanization	527	0.499	0.154	0.005	0.896
Land urbanization	527	0.154	0.104	0.006	0.637
Population density	527	7.341	0.796	5.231	8.608
Age	527	0.125	0.027	0.067	0.219
Rgdp	527	10.211	0.777	8.089	11.851
Expend	527	0.061	0.019	0.027	0.106
Medical	527	1.542	0.359	0.693	2.738
Air	527	5.638	0.242	3.892	5.903