Table 4.

Results of linear regression models on mental health and relevant variables.

Predictor		2012			2015
	Model 1	Model 2	Model 3	Model 1	Model 2	Model 3
Age	0.001 (0.003)	0.003 (0.003)	0.004 (0.003)	−0.001 (0.002)	0.001 (0.002)	0.001 *** (0.002)
Gender	0.078 (0.040)	0.095 * (0.039)	0.097 * (0.039)	0.075 * (0.034)	0.099 ** (0.033)	0.102 ** (0.033)
Marital status	0.142 ** (0.047)	0.140 ** (0.046)	0.143 * (0.046)	0.034 (0.039)	0.027 (0.039)	0.023 (0.046)
Household income	1.684 × 10−7 * (0.000)	1.372 × 10−7 * (0.000)	1.391 × 10−7 * (0.000)	5.670 × 10−8 (0.000)	5.838 × 10−8 (0.000)	5.465 × 10−8 (0.000)
Education level	0.198 *** (0.015)	0.329 *** (0.037)	0.095 *** (0.019)	0.121 *** (0.013)	0.057 ** (0.015)	0.043 ** (0.016)
Individual cognitive ability		0.329 *** (0.037)	0.314 *** (0.037)		0.250 *** (0.031)	0.234 *** (0.032)
Internet use			0.083 ** (0.026)			0.057 ** (0.019)
Constant	3.023 *** (0.210)	2.408 *** (0.219)	2.338 *** (0.219)	3.431 *** (0.173)	2.981 *** (0.180)	2.929 *** (0.214)
Adjusted R2	0.077	0.102	0.105	0.033	0.052	0.054

Standard errors are in parentheses. * p < 0.05, ** p < 0.01, *** p < 0.001.