Table 4.

Results of linear regression analysis (models 1–6).

Variable	EP				MH
	Model 1	Model 2	Model 3	Model 4	Model 5	Model 6
Firm size	−0.027	0.032	0.039	0.043	−0.187	−0.032
Industry	0.077	0.106	0.107	0.109	−0.085	−0.008
Work age	0.036	0.028	0.025	0.024	0.032	0.010
WS		−0.193**		−0.016		−0.517***
MH			0.350***	0.343***
F-value	0.575	3.013*	11.950***	9.526***	1.131	15.459***
R 2	0.009	0.059	0.200	0.200	0.017	0.245
Adj-R2	−0.007	0.040	0.183	0.179	0.002	0.229

^*p < 0.05,

^**p < 0.01,

^***p < 0.001.