Perceived Deficits Questionnaire (PDQ)

Sullivan MJ; Edgley K; DeHousx E

Distributed by Mapi Research Trust


Distributed by Mapi Research Trust

Basic description

Published in 1990, the PDQ has a 20-item (PDQ-20) and a 5-item version (PDQ-5; derived from the 20-item version). Basic description and descriptive information refers to the PDQ-20 unless otherwise noted. Information on validation and development refers to the PDQ-20. 

Although the PDQ was developed for Multiple Sclerosis (MS), it has been used in other populations as well. 


Sullivan MJ; Edgley K; DeHousx E

PDQ © 1990. Michael JL Sullivan.
To measure the degree to which individuals with MS perceive themselves as experiencing cognitive difficulties
Therapeutic area
  • Nervous System Diseases
  • Immune System Diseases
Therapeutic indication

Multiple Sclerosis

Type of Clinical Outcome Assessment (COA)
  • pro PRO
Original language(s)
  • English for Canada
Bibliographic reference(s) of the original questionnaire

Sullivan M, Edgley K, DeHousx E. A survey of multiple sclerosis, part 1: perceived cognitive problems and compensatory strategy use. Can J Rehabil. 1990;4:99–105

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Contact and conditions of use


Sullivan MJ; Edgley K; DeHousx E

Michael Sullivan, PhD
Departments of Psychology, Medicine and Neurology
McGill University
1205 Docteur Penfield
Montreal (Quebec)
H3A 1B1
Phone: 514 398 5677
Fax: 514 398 4896
E-mail: michael.sullivan@mcgill.ca

Administrative Assistant:
Chantale Bousquet
Department of Psychology
McGill University
2001 McGill College, Room 705
Montreal, Quebec H3A 1G1
Tel: +1 (514) 398 6127
Email: Chantale.Bousquet@McGill.ca

Contact information

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Phone: +33 (0)4 72 13 66 66

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Original language(s)

  • English for Canada


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