Table 3

Results from the ROC curve analysis with clinical relevance set at two different levels on the external anchor (GROC scale)

AUC 95% CI
Improved nNo change nROC cut-off point (MCID)AUCSELower boundUpper boundSensitivity (95% CI)Specificity (95% CI)
Equating important change with a GROC ≥3
Absolute change score7119>130.921*0.030.8450.96878.7 (67.6 to 87.7)94.7 (74.0 to 99.9)
Relative change score>15.40.745*0.060.6430.83194.4 (86.2 to 98.4)47.4 (24.4 to 71.1)
Equating important change with a GROC ≥5
Absolute change score5139>150.924*0.020.8480.96982.3 (69.1 to 91.6)92.3 (79.1 to 98.4)
Relative change score>500.763*0.040.6620.84651.1 (36.6 to 65.2)92.3 (79.1 to 98.4)
  • AUC, area under the curve; GROC, global rating of change; MCID, minimum clinically important difference; ROC, receiver-operating characteristic curve.

  • *p<0.001.