Table 4. Results of Hierarchical Regression Analysis.

Step	Variable entered	B	Beta	P	R Square	R Square Change	F	Sig
Step 1					0.080	0.080	7.568	<0.001
	Personal Characteristics
	Education level	-0.079	-0.187	0.001
	Professional status	0.087	0.156	0.001
Step 2					0.121	0.041	7.496	<0.001
	Personal Characteristics
	Professional status	0.081	0.144	0.003
	Organizational Characteristics
	Type of organization	-0.166	-0.314	0.006
Step 3					0.341	0.220	24.981	<0.001
	Practice environment (PES-NWI Score)	0.359	0.494	<0.001