Table 5. . Regression model of predictors of patient pain medication use.

Variable	β (95% CI)	SE	Std β	t (signif.)	R2 for step	Adj. R2 for step	R2 change (signif.)
Step 1: pain duration	0.007 (-0.002, 0.015)	0.004	0.138	1.582	0.034	0.025	0.034*
Step 2: nonpain medication count	0.164 (0.058, 0.270)	0.053	0.266	3.067**	0.113	0.098	0.080**
Step 3: patient-reported pain	0.006 (-0.005, 0.017)	0.006	0.100	1.038	0.157	0.135	0.044*
Step 4: patient-reported disability	0.024 (0.004, 0.045)	0.011	0.226	2.329*	0.195	0.167	0.038*

*p < 0.05.

**p < 0.01.

SE: Standard error; signif.: Signifcance.