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Validation of the semi-structured Psychotic Depression Assessment Scale (PDAS) interview

  • Rugül Köse Çinar (a1) and Søren Dinesen Østergaard (a2)

Abstract

Objective

Recently, a semi-structured interview dedicated to aid rating on the Psychotic Depression Assessment Scale (PDAS) was developed. Here, we aimed to validate PDAS ratings collected via this semi-structured interview.

Methods

A total of 50 patients with psychotic depression – 34 with unipolar psychotic depression and 16 with bipolar psychotic depression – were recruited for the study. The following aspects of validity were investigated: clinical validity, psychometric validity (scalability), and responsiveness.

Results

The PDAS ratings were clinically valid (Spearman’s coefficient of correlation between PDAS total scores and Clinical Global Impressions scale – severity of illness ratings=0.66, p<0.001), scalable (Loevinger’s coefficient of heterogeneity at endpoint=0.45), and responsive (no participants met the criterion for remission on the PDAS (total score <8) at baseline – at endpoint 74% (95% CI: 60–85) of the participants met this criterion).

Conclusions

The semi-structured PDAS interview provides valid ratings of the severity of psychotic depression.

Copyright

Corresponding author

*Rugül Köse Çinar, MD, Department of Psychiatry, Trakya University Hospital, Edirne, Turkey. Tel: 905337330407; Fax: 902842353451; E-mail: rugulkose@trakya.edu.tr

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Acta Neuropsychiatrica
  • ISSN: 0924-2708
  • EISSN: 1601-5215
  • URL: /core/journals/acta-neuropsychiatrica
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