If you use the Neck Disability Index you will need to score based in the criteria below.
Score: /50 Transform to percentage score x 100 = %points
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