Perceived Deficits Questionnaire – Depression (PDQ-D)

The Perceived Deficits Questionnaire – Depression (PDQ-D) is a brief patient-rated scale to assess subjective cognitive dysfunction in people with depression. The PDQ-D is a 20-item questionnaire that generates a total score and 4 subscale scores (attention/concentration, retrospective memory, prospective memory, and planning/organization). A 5-item version (PDQ-D-5) is also available.

The PDQ-D was originally developed by Dr. Michael Sullivan at McGill University as a scale for use in patients with multiple sclerosis. It has since been adapted and validated for use in patients with major depressive disorder. There are also Chinese and Korean versions of the PDQ-D.

The PDQ-D is provided free for non-commercial use and is available for download at the eProvide web site.

The PDQ-D-5 is also included in our MoodFx online app  and in the THINC-it cognitive screener.


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Lam RW, Lamy FX, Danchenko N, Yarlas A, White M, Rive B, Saragoussi D. Psychometric validation of the Perceived Deficits Questionnaire – Depression (PDQ-D) instrument in a survey of US and UK respondents. Neuropsychiatric Disease and Treatment, in press.

Kim J-M, Hong J-P, Kim S-D, Kang H-J, Lee Y-S. Development of a Korean version of the perceived deficits questionnaire for patients with major depressive disorder. Clin Psychopharmacol Neurosci. 2016;14:26–32.

Shi C, Wang G, Tian F, Han X, Sha S, Xing X, Yu X. Reliability and validity of Chinese version of perceived deficits questionnaire for depression in patients with MDD. Psychiatry Res. 2017;252:319–24.