Table 6.

Mediating effect test results.

Variable	Technological innovation	Comprehensive total factor productivity	Factor endowment structure	Comprehensive total factor productivity	Human capital	Comprehensive total factor productivity
	lnRD(1)	lnCTFP(2)	lnKL(3)	lnCTFP(4)	lnHC(5)	lnCTFP(6)
Constant	2.512 (0.94)	6.955** (2.06)	13.123*** (3.03)	6.021* (1.75)	2.857*** (5.56)	5.415 (1.51)
lnDIG	0.107*** (5.28)	0.298*** (11.09)	0.076** (2.33)	0.311*** (12.02)	0.043*** (11.04)	0.289*** (9.28)
lnRD		0.199** (2.56)
lnKL				0.109** (2.27)
lnHC						0.714** (1.75)
Controls	Yes	Yes	Yes	Yes	Yes	Yes
R2	0.270	0.694	0.081	0.693	0.573	0.690
N	300	300	300	300	300	300