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The NDI has become a standard instrument for measuring self-rated disability due to neck pain and is used by both clinicians and researchers. Each of the 10 items scores from 0 to 5. The maximum score is 50. The obtained score can be multiplied by two to produce a percentage score. Occasionally, a respondent will not complete one question or another. The average of all other items is then added to the completed items. The original report provided scoring intervals for interpretation, as follows: 0 to 4 = no disability 5 to 14 = mild 15 to 24 = moderate 25 to 34 = severe Above 34 = complete Please note: The means 15 24 out of 50 (the RAW SCORE) equates with moderate disability. Use the NDI at baseline and for every two weeks thereafter within the treatment program to measure progress. As noted, at least a 5-point change is required to be meaningful clinically. Patients often do not score the items as zero, once they are in treatment. In other words, it is common to find that patients will continue to score between 5 - 15 despite having made excellent recovery (i.e., they may be back to work). Avoid the trap of treating until zero, as this is not supportable based on current evidence