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Table 2 Responsiveness estimates of the 3 versions of the NDI

From: A brief 5-item version of the Neck Disability Index shows good psychometric properties

  AUC (95% CI) ES (95% CI)
NDI 0.76 (0.63, 0.89) 0.71 (0.40, 1.02)
NDI-5 ordinal 0.71 (0.57, 0.85) 0.57 (0.27, 0.86)
NDI-5 linear 0.72 (0.59, 0.86) 0.85 (0.53, 1.17)
  1. AUC area under the receiver operating characteristic curve for identifying a clinically meaningful changed defined as a GPRC of -2 or lower, or +2 or higher. ES effect size over 1 month of physiotherapy treatment [(mean post – mean pre) / SD pre].