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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].
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Health and Quality of Life Outcomes

ISSN: 1477-7525

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