Table 6.

The robustness test of land urbanization.

Variables	DIFF-GMM
	Eastern region		Central regions		Western regions
	(1)	(2)	(3)	(4)	(5)	(6)
	Morbidity	Mortality	Morbidity	Morbidity	Mortality	Morbidity
Land urbanization	−0.9252***	−1.6577	0.6192**	0.7437	0.1210***	0.0378**
	(−2.776)	(−0.768)	(2.402)	(1.339)	(2.934)	(2.390)
Population density	8.7626	2.0615	−3.3557	−2.0959	6.8670	3.3015
	(0.950)	(0.405)	(−0.544)	(−0.543)	(1.071)	(0.709)
Age	1.0876	−1.0846	2.5570**	−6.1144	1.3447	7.4087*
	(0.769)	(−0.640)	(2.474)	(−0.590)	(1.599)	(1.862)
Rgdp	0.1413	0.3092	0.6453*	0.4276	−0.7101**	−0.9036
	(1.047)	(0.975)	(1.825)	(0.716)	(−2.277)	(−1.019)
Expend	−0.2799	−2.8727	−1.0627**	−1.5019	−1.1651	1.3852
	(−0.087)	(−0.461)	(−2.043)	(−0.468)	(−1.456)	(1.635)
Medical	−0.2358**	0.1492*	−0.6163**	1.2861	0.1989	0.1083
	(−2.178)	(1.819)	(−2.133)	(0.579)	(1.007)	(0.156)
Air	−0.1463	0.0500	0.5108	0.0017	−0.1499	−0.0555
	(−0.969)	(1.297)	(1.103)	(0.017)	(−1.055)	(−0.228)
L.disease	0.5321***	−0.8979***	−1.1119***	1.4820***	−0.3722***	1.8112***
	(4.658)	(−2.998)	(−3.528)	(3.098)	(−2.949)	(3.643)
AR_1	0.0267	0.018	0.0407	0.0131	0.0162	0.0129
AR_2	0.1346	0.5454	0.204	0.1463	0.2434	0.4116
Sargan text	0.7656	0.8976	1.0000	1.0000	0.9995	0.9683
Observations	204	204	153	153	170	170

***, **, *The significance level of 1, 5 and 10%, respectively. The numbers with asterisks in the corresponding rows of all variables in the table represent the estimation coefficients, and the values in the parentheses are the corresponding T statistical values, and the P values of AR_1, AR_2, and Sargan test are provided respectively.