Figure 1  .

Receiver operator characteristic (ROC) curves for ΔSDQ (Shoulder Disability Questionnaire, ΔPSS (Pain Severity Scale) and ΔFSQ (Functional Status Question) at one month. True positive rate (sensitivity) and false positive rate (100-specificity) are for discriminating between patients reporting clinical improvement or clinical stability. Potential cut off points for the SDQ: ΔSDQ = 18.75: sensitivity 74%, specificity 77% (optimal trade off); ΔSDQ = 40: (mean change in clinically improved patients) sensitivity 46%, specificity 98%.