Table 4.

Estimation results of moderating effect.

Variables	Model 1	Model 2	Model 3
Salary level	0.0246 (0.6456)	0.3524 (0.1432)	0.2636* (0.4365)
Labour intensity * salary level	0.0124 (0.4328)	0.0324** (0.6834)	0.1537* (0.7156)
Working hours	0.5265 (0.9342)	0.4278 (0.8326)	0.5023*** (0.2475)
Labour intensity * working hours	0.2146** (0.3215)	0.3547*** (0.5452)	0.3124*** (0.3486)
Age	-	0.5375 (0.7246)	0.4328*** (0.6143)
Academic	-	-	0.2321 (0.4122)
Gender	-	-	0.1326* (0.5129)
R 2	0.4023	0.2011	0.3212
Adjusted R-square	0.6782	0.5163	0.6166
VIF	3.135	2.242	3.026

***P ≤ 0.001, **P ≤ 0.01, *P ≤ 0.05; Robust standard error in brackets.

VIF, variance inflation factor.

Source: authors' own.