This application web is based on a research paper* and it offers the factor loading of each item of the NDI Questionnaire** and normalized scores from Confirmatory Factor Analysis of 1333 participants. A new model proposed, which is that of a single-factor structure and the use of a single cumulative score. The proposed model is determined from a general population and from both gender and a specific whiplash associated disorder (WAD) subgroups.

NECK DISABILITY INDEX REFERENCES VALUES (NDI_REVA)

Single factor underlying NDI

GENDER:           WAD:
PAIN INTENSITY   PERSONAL CARE
LIFTING   WORK
HEADACHES   CONCENTRATION
SLEEPING   READING
DRIVING   RECREATION

SCORE ---

This research was partially funded by grants from the OTRI-UMA (8.06/5.42.3064-1) and grants from the Spanish Ministry of Education (JC2009-0047)

*Gabel CP, Cuesta-Vargas AI, Osborne J, Burkett B, Melloh M. Confirmatory Factor Analysis of the Neck Disability Index Indicates a Single-Factor Model with Gender Variation. The Spine Journal 2012 (under review)
**Vernon H, Mior S. The Neck Disability Index: A study of reliability and validity. Journal of Manipulative and Physiological Therapeutics 1991; 14:409-415