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Table 4 Summary of reliability and responsiveness indices

From: Translation of the Neck Disability Index and validation of the Greek version in a sample of neck pain patients

Property Index NDI
Reliability Cronbach alpha 0.85
  Intraclass Correlation Coefficient 0.93 (95%CI 0.84–0.97)
Responsiveness Spearman's correlation coefficient 0.3 (P = 0.02)
  Standard Error of Measurement 0.64
  Minimal Detectable Change 1.78