Table 4 Multiple regression analysis of overall job satisfaction with predictor range of procedures and confounding variables

N = 16 877.*

PREDICTOR VARIABLES	STANDARDIZED BETA	T	P
Range of procedures	.040	4.906	.0001
Age	.028	3.487	.0001
Sex	−.014	−1.736	.083
Group or solo practice	.042	5.419	.0001
Population served by practice:
urban vs rural	−.101	−9.899	.0001
semiurban vs rural	−.024	−2.422	.015
Teaching	.052	6.794	.0001
Constraints to medical care services	−.227	−30.412	.0001
Balance of personal and professional commitments	.140	18.641	.0001

↵* Total varies from the sample size of 20 507 because analysis was conducted only on physicians with complete data for all variables. All the predictor variables correlated with overall job satisfaction (R = 0.302), therefore, all the predictor variables explain 9.1% of the variance (R2 = .91).