Table 7.

Robustness test results.

	Input	Input	Input	Input	Input	Input	Input
	(1)	(2)	(3)	(4)	(5)	(6)	(7)
DID	1.704*** (3.18)	0.195** (2.60)	1.188*** (4.78)	2.086*** (3.03)	2.261*** (3.63)	2.059*** (3.14)	2.211*** (3.67)
policy60	1.726*** (2.89)
Fixed effect	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Control variables	Yes	Yes	Yes	No	Yes	No	Yes

Robust t-statistics in parentheses, ***p < 0.01; **p < 0.05; *p < 0.1.