Validity and severity thresholds for the depression subscale of the affective self rating scale: An equipercentile equating study using classical test theory

S. J. Sharp, M. A. Bond, K. S. Chiang, S. J. Collier, J. Farrington, T. Lanza di Scalea, C. B. Nemeroff, D. J. Newport, D. A. Spelber, S. M. Strakowski, J. R.C. Almeida

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The Affective Symptoms Scale (ASRS) is a unique instrument designed to separately measure depressive and manic symptoms in mood disorders. We validated the ASRS against the Patient Health Questionnaire (PHQ-9) and the Quick Inventory of Depressive Symptomatology (QIDS-16). Methods: A retrospective study of 258 patients who completed the PHQ-9, QIDS-16 and ASRS as part of routine clinical care. To establish meaningful clinical thresholds for the depression subscale of the ASRS, it was equated with the QIDS and the PHQ-9. Results: The depression subscale of the ASRS had significant positive correlations with the QIDS-16 and the PHQ-9 (respectively, r= 0.8, t[253] = 19.8, p < 0.001, and r= 0.8, t[245] = 28.2, p < 0.001). The equipercentile equating method with the PHQ-9 indicated that the thresholds corresponded to ASRS depression subscale scores of 5.4, 10.6, 16.1, and 23. Equating with the QIDS indicated that thresholds corresponded to ASRS depression subscale scores of 5.1, 11, 18.4, and 27.5. Limitations: Limitations include a small sample size that did not allow more detailed statistical analysis, such as Item Response Theory. The population is a heterogenous population at a university outpatient setting. Conclusions: The ASRS depression subscale significantly correlated with the PHQ-9 and QIDS-16. Our proposed threshold scores for the ASRS are 5, 11, 16 and 23 to indicated mild, moderate, severe and very severe depression respectively.

Original languageEnglish (US)
Pages (from-to)541-548
Number of pages8
JournalJournal of affective disorders
Volume296
DOIs
StatePublished - Jan 1 2022
Externally publishedYes

Keywords

  • Affective symptoms scale
  • Classical Test Theory
  • Mood Disorders
  • Patient health questionnaire
  • Quick inventory of depressive symptomatology
  • Severity Thresholds

ASJC Scopus subject areas

  • Clinical Psychology
  • Psychiatry and Mental health

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