Abstract
Takasaki H, Chien C-W, Johnston V, Treleaven J, Jull G. Validity and reliability of
the Perceived Deficit Questionnaire to assess cognitive symptoms in people with chronic
whiplash-associated disorders.
Objective
To investigate the validity and reliability of the Perceived Deficit Questionnaire
(PDQ) for use in people with chronic whiplash-associated disorders.
Design
Cross-sectional.
Setting
Tertiary institution.
Participants
Patients (N=105) with chronic whiplash-associated disorders and asymptomatic controls
(n=50).
Interventions
Not applicable.
Main Outcome Measures
The 20-item PDQ inclusive of 4 sections (attention/concentration, retrospective memory,
prospective memory, and organization/planning) rated on a 5-point scale.
Results
Internal construct validity of the PDQ was examined by Rasch analysis, confirming
the appropriateness of its 5-point scale and the unidimensionality of each section
after modification by eliminating 1 item each from the attention/concentration and
retrospective memory sections. Preliminary evidence was also gained for external construct
validity (convergent validity) of the modified PDQ by demonstrating significant (P<.05) correlations of all sections with a global measure of disability due to neck
pain (the Neck Disability Index). The whiplash group demonstrated significantly (P<.05) higher scores in each section of the modified PDQ than did the control group,
indicating evidence for discriminant validity. In addition, the modified PDQ demonstrated
good internal consistency (Rasch-generated reliability >.8) and acceptable test-retest
reliability with 1-month interval (intraclass correlation coefficients >.8).
Conclusions
The modified PDQ appears to be a valid and reliable questionnaire and could be used
quickly in clinical practice to gain a basic understanding of perceived cognitive
symptoms in people with chronic whiplash-associated disorders.
Key Words
List of Abbreviations:
MnSq (mean square), NDI (Neck Disability Index), PDQ (Perceived Deficits Questionnaire), WAD (whiplash-associated disorders), Zstd (standardized Z value)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: May 28, 2012
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.
Reprints are not available from the author.
In-press corrected proof published online on Jul 14, 2012, at www.archives-pmr.org.
Identification
Copyright
© 2012 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
