Fig. 3.

Receiver operating characteristic (ROC) curve to determine the responsiveness of the Quick Motor Function Test (QMFT), with clinical judgment as the external factor. Sensitivity was defined by dividing the number of patients, who had been identified by the QMFT to have changed, by the number of patients who had truly undergone change as based on the judgment of two physicians. Specificity was defined as the number of patients who had been identified by the QMFT to not have changed, divided by the number of patients who had not changed, based on the judgment of the same physicians