Scoring: For each section the total possible score is 5: if the first statement is marked the section score = 0, if the last statement is marked it = 5. If all ten sections are completed the score is calculated as follows: Example:16 (total scored)
50 (total possible score) x 100 = 32% If one section is missed or not applicable the score is calculated: 16 (total scored)
45 (total possible score) x 100 = 35.5% Minimum Detectable Change (90% confidence): 5 points or 10 %points
NDI developed by: Vernon, H. & Mior, S. (1991). The Neck Disability Index: A study of reliability and validity. Journal of Manipulative and Physiological Therapeutics. 14, 409-415