Article

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.
CI - Copyright (c) 2012 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS