Table 5.

Results of linear regression analysis (models 7–9).

Variable	MH
	Model 7	Model 8	Model 9
Firm size	−0.187	0.012	0.011
Industry	−0.085	0.002	0.001
Work age	0.032	0.001	0.002
WS		−0.426***	−0.434***
SL		0.383***	0.387***
WS × SL			0.030
F value	1.131	20.548***	17.134***
R 2	0.017	0.351	0.352
Adj-R2	0.002	0.334	0.332

^*p < 0.05,

^**p < 0.01,

^***p < 0.001.