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Table 3 The responsiveness of correlation and ROC curve analyses for each questionnairea

From: Comparison of the responsiveness of the WOMAC and the 12-item WHODAS 2.0 in patients with Kashin–Beck disease

QuestionnairesCorrelation analysisROC curve analysis
Coefficient bp-valueAUC (95% CI)Optimal cutoff valueSensitivitySpecificity
WOMAC
 Pain0.52< 0.0010.76 (0.69, 0.83)22.500.680.76
 Stiffness0.46< 0.0010.74 (0.67, 0.81)6.250.890.53
 Function0.45< 0.0010.74 (0.67, 0.81)14.700.740.68
 Total score0.52< 0.0010.77 (0.70, 0.83)10.410.830.60
WHODAS 2.0
 Cognition0.220.0010.64 (0.56, 0.72)−18.750.890.31
 Mobility0.41< 0.0010.72 (0.65, 0.80)6.250.760.58
 Self-care0.26< 0.0010.64 (0.56, 0.72)18.750.600.67
 Getting along0.040.5090.55 (0.46, 0.64)18.750.430.68
 Life activities0.40< 0.0010.68 (0.61, 0.76)−6.250.910.39
 Participation in society0.38< 0.0010.68 (0.60, 0.76)6.830.700.58
 Total score0.38< 0.0010.71 (0.63, 0.78)22.310.510.82
  1. ROC receiver operating characteristic, AUC area under the curve, CI confidence interval, WOMAC Western Ontario and McMaster Universities Osteoarthritis index, WHODAS 2.0 World Health Organization Disability Assessment Schedule 2.0 (12-item)
  2. a The external criterion was the joint dysfunction index (JDI)
  3. b Spearman’s correlation coefficient was used