Table 4.

The effect of internet use on depression from propensity score matching (PSM).

Matching algorithm	Treated	Control	ATT	S.E.	T-statistics	Rosenbaum bounds
NN(1)	6.412	7.455	−1.042	0.208	−5.02***	1.75–1.76
NN(5)	6.412	7.395	−0.983	0.167	−5.88***	2.14–2.15
NN(10)	6.412	7.379	−0.967	0.164	−5.88***	2.20–2.21
Radius	6.412	7.328	−0.916	0.165	−5.53***	2.21–2.22
Kernel	6.374	7.319	−0.946	0.156	−6.08***	2.33–2.34

Authors' own calculation.

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