Table 8. Heterogeneity test.

variable	Public attention		Level of environmental regulation		Factor intensity
	High	Low	High	Low	Capital intensive	skill-intensive	labor-intensive
	(1)	(2)	(3)	(4)	(5)	(6)	(7)
dig	-0.048**	-0.037***	-1.309***	-0.063	-0.857**	-0.307	-0.199**
	[0.020]	[0.009]	[0.351]	[0.047]	[0.387]	[0.206]	[0.074]
N	7857	13975	8954	17574	11262	10088	9244
Intergroup coefficient test	0.27		4.61**		9.15***
R2	0.236	0.185	0.292	0.233	0.243	0.045	0.412

Note

***, ** and * indicate significance level of 1%, 5%and 10%, respectively.