Table 6.

Results of hierarchical regression.

	Model 1		Model 2		Model 3		VIF
	β	T Value	β	T Value	β	T Value
Control variables
Gender	0.002 ns	0.034	0.012 ns	0.212	0.002 ns	0.041	1.143
Age	0.078 ns	1.273	0.018 ns	0.302	0.034 ns	0.590	1.269
Edu.	0.001 ns	0.017	0.046 ns	0.675	0.041 ns	0.609	1.706
City	0.013 ns	0.213	0.056 ns	0.993	0.061 ns	1.087	1.204
Tenure	−0.034 ns	−0.564	−0.028 ns	−0.496	−0.017 ns	−0.308	1.183
PIE	−0.023 ns	−0.305	0.069 ns	0.969	0.058 ns	0.820	1.884
Main variables
HKS			0.280 ***	4.525	0.288 ***	4.697	1.438
SIT			0.166 **	2.649	0.148 *	2.380	1.475
Interaction variables
SIT × HKS					0.146 **	2.787	1.041
R2	0.009		0.133		0.153
Adjusted R2	−0.009		0.111		0.130
△R2	0.009		0.124		0.020
F (df)	0.479 (6) ns		6.206 (8) ***		6.495 (9) ***
△F	0.479 ns		23.192 ***		7.769 **

Note: * p < 0.05, ** p < 0.01, *** p < 0.001, ns, nonsignificant.