Table 5.

Results of the subgroups analysis (age, sex, residence).

Variables	Age		Sex		Residence
	<70	> =70	Male	Female	Urban	Rural
Internet	−0.2938*	−0.1627	−0.2090	−0.4455**	−0.3782**	−0.7812***
	(0.1624)	(0.2484)	(0.1977)	(0.1761)	(0.1589)	(0.2205)
atanhrho_12	0.1328	0.1031	0.1161	0.2035**	0.1826*	0.3981***
	(0.0937)	(0.1372)	(0.1152)	(0.0994)	(0.0961)	(0.1063)
Results of First Stage—use Internet or not
Internet penetration rate of the county level	2.5408***	2.5749***	2.5479***	2.5195***	2.6401***	1.8944***
	(0.2214)	(0.3691)	(0.2524)	(0.2878)	(0.2287)	(0.3598)
Covariates	Yes	Yes	Yes	Yes	Yes	Yes
N	4,921	2,696	3,839	3,778	3,678	3,939
Variables		Education
Results of the subgroups analysis (education)
		Illiteracy	High school or less	College or more
Internet		−0.7993*	−0.3952**	−0.6619
	(0.4207)	(0.1554)	(0.5143)
atanhrho_12		0.3878**	0.1822**	0.4735
		(0.1814)	(0.0904)	(0.3051)
Results of First Stage—use Internet or not
Internet penetration rate of the county level		1.8105***	2.5785***	2.5558***
		(0.5212)	(0.2131)	(0.9065)
Covariates		Yes	Yes	Yes
N		2,906	4,524	187

^{***, **, and *}indicate significance at 1, 5, and 10%, respectively. Standard errors are presented in parentheses.