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J Affect Disord. 2014 May;160:68-73. doi: 10.1016/j.jad.2013.12.020. Epub 2014 Jan 2.

Measuring treatment response in psychotic depression: the Psychotic Depression Assessment Scale (PDAS) takes both depressive and psychotic symptoms into account.

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Unit for Psychiatric Research, Aalborg Psychiatric Hospital, Aalborg University Hospital, Mølleparkvej 10, DK-9000 Aalborg, Denmark; Institute of Clinical Medicine, Aarhus University Hospital, Aarhus, Denmark; Depression Clinical and Research Program, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA. Electronic address:
Department of Psychiatry, Weill Medical College of Cornell University and New York Presbyterian Hospital, Westchester Division, White Plains, NY, USA.
Department of Psychiatry, University Health Network, Toronto, Ontario, Canada; Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada.
Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada; Centre for Addiction and Mental Health, Toronto, Ontario, Canada; Western Psychiatric Institute and Clinic, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
Western Psychiatric Institute and Clinic, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
University of Massachusetts Medical School, Worcester, MA, USA.
Psychiatric Research Unit, Psychiatric Center North Zealand, Copenhagen University Hospital, Hillerød, Denmark.
University of Massachusetts Medical School and University of Massachusetts Memorial Health Care, Worcester, MA, USA.



There is no established psychometric instrument dedicated to the measurement of severity in psychotic depression (PD). The aim of this study was to investigate whether a new composite rating scale, the Psychotic Depression Assessment Scale (PDAS), covering both the psychotic and the depressive domains of PD, could detect differences in effect between two psychopharmacological treatment regimens.


We reanalyzed the data from the Study of Pharmacotherapy of Psychotic Depression (STOP-PD), which compared the effect of Olanzapine+Sertraline (n=129) versus Olanzapine+Placebo (n=130). The response to the two regimens was compared using both a mixed effects model and effect size statistics on the total scores of three rating scales: the 17-item Hamilton Depression Rating Scale (HAM-D17), its 6-item melancholia subscale (HAM-D6), and the 11-item PDAS consisting of the HAM-D6 plus five items from the Brief Psychiatric Rating Scale covering psychotic symptoms.


According to both statistical approaches, the PDAS, the HAM-D17 and the HAM-D6 were all able to detect significant differences in treatment effect between Olanzapine+Sertraline and Olanzapine+Placebo (Olanzapine+Sertraline being superior). Notably, 45% of the trial participants were at least "probable psychotic" at their last assessment in the trial.


The STOP-PD was not designed specifically to answer the research questions of the present study.


The Psychotic Depression Assessment Scale (PDAS) is a sensitive measure of treatment response in PD. The fact that 45% of the patients still experienced psychotic symptoms at their last trial assessment emphasizes the need to include items pertaining to psychotic symptoms in rating scales for PD.


Affective disorders, psychotic; Antidepressive agents; Antipsychotic agents; Psychiatric status rating scales

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