Table 3. Accuracy of Pain Measures for Detecting Improvement in Randomized Trial and Observational Cohort Groups.

	Accuracy for Detecting any Improvement		Accuracy for Detecting Moderate Improvement*
	Randomized Trial AUC (SE)	Observational Cohort AUC (SE)	Randomized Trial AUC (SE)	Observational Cohort AUC (SE)
BPI severity	0.81 (0.036)	0.83 (0.032)	0.85 (0.035)	0.81 (0.038)
BPI interference	0.78 (0.040)	0.70 (0.043)	0.77 (0.046)	0.67 (0.052)
BPI total	0.81 (0.038)	0.78 (0.036)	0.81 (0.042)	0.76 (0.044)
PEG	0.78 (0.038)	0.73 (0.040)	0.79 (0.042)	0.70 (0.050)
CPG intensity	0.78 (0.039)	0.75 (0.043)	0.82 (0.040)	0.73 (0.055)
CPG disability	0.75 (0.040)	0.65 (0.044)	0.76 (0.043)	0.66 (0.053)
Roland disability	0.81 (0.037)	0.70 (0.044)	0.85 (0.038)	0.70 (0.050)
SF bodily pain	0.72 (0.044)	0.68 (0.046)	0.77 (0.043)	0.70 (0.054)

AUC is probability of correctly discriminating between patients who have improved and those who have not.

^*Moderate improvement = global rating of “moderately,” “a lot,” or “completely” better.

AUC indicates area under the receiver operating characteristic curve; BPI, brief pain inventory; CPG, chronic pain grade; SF, Medical Outcomes Study Short Form-36; SE, standard error.