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Table 1 Relative (ICC) and absolute (MDC 90 ) reliability estimates over 1 week*

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

  ICC (95% CI) SEM (95% CI) MDC 90
NDI10 0.92 (0.85, 0.96) 1.95 (1.76, 2.67) 4.5
NDI5 0.91 (0.83, 0.96) 1.15 (0.95, 1.45) 2.7
NDI5 linear 0.89 (0.80, 0.95) 1.05 (0.98, 1.48) 2.4
  1. *: Only those subjects who indicated a stable condition over this period, as indicated by a GPRC of -1, 0, or +1, are included in this analysis (n=36).