Table 8.

The effect of internet use on depression using the endogenous switching regression (ESR) model.

	ATT	S.E.	T-statistics
Main effects	−3.370	0.069	−48.768***
Age ≤ 60	−3.251	0.077	−42.090***
Age > 60	−3.772	0.148	−25.571***
Male	−3.145	0.084	−37.400***
Female	−3.648	0.099	−36.732***
Agricultural work	−3.627	0.122	−29.625***
No agricultural work	−3.252	0.080	−40.480***

Author' own computation. The F-statistic of the strength test of instrumental variables in the selection function is 1,335.285 (P-value = 0.000). T-statistics from tests over the differences in the effects of internet use on depression are −11.12 (P-value = 0.000) for age, −12.85 (P-value = 0.000) for gender, and 8.74 (P-value = 0.000) for agricultural work.

^*** indicates the significance level of 1%.