Table 5.

Relationship between identified factors and providers’ likelihood of participating in clinical trial referral activities^a

	Coefficient	Robust Standard Error	P	95% Confidence Interval
Variable:
Importance of referral	0.61	0.16	< 0.001	0.28	0.94
Clinic-level interventions	0.28	0.07	< 0.001	0.15	0.42
Constant	−0.99	1.48	0.507	−3.94	1.97

^a Assessments indicated no violation of assumptions of linear regression. Visual patterns in scatterplots confirmed linear relationships, Shapiro-Wilk p = 0.99 for multivariate normality, variance inflation factors < 5 indicate little multicollinearity, the Durbin-Watson coefficient 2.06 indicates no autocorrelation, and residual plots indicate homoscedasticity