Article

OBJECTIVE: To establish an appropriate scoring system using Rasch scores for the
strategic, tactical, and operational levels of the Neck Pain Driving Index (NPDI)
and to refine the NPDI by testing the unidimensionality of each driving
performance level using Rasch analysis. DESIGN: Cross-sectional. SETTING:
Tertiary institution. PARTICIPANTS: Individuals with chronic whiplash-associated
disorders (WAD) (N=123). INTERVENTIONS: Not applicable.
MAIN OUTCOME MEASURE: The
NPDI, which was developed to evaluate self-reported driving difficulty in people
with chronic WAD. RESULTS: On the basis of Rasch analyses, modifications were
made to the response format, changing it from a 0 to 4 scale (0=no difficulty,
1=slight difficulty, 2=moderate difficulty, 3=great difficulty, 4=unable to drive
because of the injury) to a 0 to 3 scale (0=no difficulty, 1=slight difficulty,
2=moderate difficulty, 3=great difficulty and unable to drive because of the
injury). Unidimensionality of the strategic and operational levels was confirmed.
Modification of the tactical level was necessary to ensure its unidimensionality.
After removing the tasks "driving near (your) collision site," "driving in a bad
weather condition," and "driving at night," unidimensionality of the 4-item
tactical level was confirmed. A 9-item NPDI was established. A table converting
raw total scores into Rasch scores was created for each level. CONCLUSIONS: This
study established the 9-item NPDI, and its 3 subsections (strategic, tactical,
and operational levels) are unidimensional. The magnitude of self-reported
driving difficulty at each of the 3 subsections can be assessed with the use of a
0 to 3 scale and Rasch scores.
CI - Copyright (c) 2013 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS