Abstract
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.
Keywords
List of abbreviations:
MnSq (mean square), NDI (Neck Disability Index), NPDI (Neck Pain Driving Index), WAD (whiplash-associated disorder)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: March 04, 2013
Footnotes
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.
Identification
Copyright
© 2013 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
