Table 6.

Heterogeneity test—region differences.

Variable	Eastern region	Central region	Western region
	(1)	(2)	(3)
dig	0.4855***	−0.1030	−1.6318**
	(0.0755)	(0.7754)	(0.6532)
age	0.0460***	0.0413***	0.0468***
	(0.0051)	(0.0071)	(0.0064)
age_2	−0.0003***	−0.0002***	−0.0002***
	(0.0001)	(0.0001)	(0.0001)
gender	−0.1993***	−0.1143***	−0.1693***
	(0.0292)	(0.0380)	(0.0393)
eduyear	0.0027	−0.0088**	−0.0009
	(0.0036)	(0.0043)	(0.0039)
marriage	−0.0379	−0.0321	0.0364
	(0.0461)	(0.0639)	(0.0557)
smoke	−0.0140	−0.0594	−0.0288
	(0.0332)	(0.0423)	(0.0425)
drink	−0.1886***	−0.0861*	−0.2432***
	(0.0376)	(0.0484)	(0.0571)
familysize	−0.0277***	−0.0521***	−0.0182**
	(0.0074)	(0.0089)	(0.0090)
lnfincomeper	−0.0741***	−0.0360*	−0.0310
	(0.0160)	(0.0202)	(0.0189)
lngdp	−0.0534	−0.1284	0.1630
	(0.0581)	(0.1552)	(0.1328)
lnmediexp	0.0999	0.2348	−0.1972
	(0.0665)	(0.1980)	(0.1941)
N	8,753	5,873	5.475
R2	0.1135	0.1051	0.1387