Table 7.

Difference-in-Differences Regression Results

Model Variable	(1)	(2)	(3)	(4)
	Comprehensive Technical Efficiency	Scale Efficiency	Comprehensive Technical Efficiency	Scale Efficiency
Difference-in-differences variable	0.10*	0.12***	0.10	0.12*
Economic development levellogarithm	0.01	−0.01	0.01	−0.01
Population density logarithm	−0.16**	−0.07	−0.16***	−0.07
Urbanization level	0.47*	0.51**	0.47	0.51
Goodness of fit	0.11	0.11	0.11	0.11
Constant term	1.72***	1.23***	1.72***	1.23***

Notes: *p< 0.005, **p<0.01, ***p<0.0001.