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1 results

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

  • Rugül Köse Çinar, Søren Dinesen Østergaard
  • Journal:
    Acta Neuropsychiatrica / Volume 30 / Issue 3 / June 2018
    Published online by Cambridge University Press:
    24 May 2017, pp. 175-180
  • 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.