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Related Experiment Videos

Outcome definitions and predictors in depression

J Tedlow1, M Fava, L Uebelacker

  • 1Depression Research Program, Clinical Psychopharmacology Unit, Massachusetts General Hospital, Boston, MA 02114, USA. tedlowj@a1.mgh.harvard.edu

Psychotherapy and Psychosomatics
|August 7, 1998
PubMed
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Lower baseline depression and anxiety predict better antidepressant treatment response. How treatment outcomes are defined significantly impacts study results and observed relationships with predictive variables.

Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Pharmacology

Background:

  • The definition of treatment outcome is critical in antidepressant studies.
  • Investigating the link between baseline depression/anxiety severity and outcome definitions is essential.

Purpose of the Study:

  • To explore the relationship between baseline depression and anxiety severity and various outcome definitions in major depressive disorder patients undergoing antidepressant treatment.
  • To analyze how different outcome measures influence the interpretation of treatment effectiveness.

Main Methods:

  • 248 outpatients with major depressive disorder received 8 weeks of fluoxetine treatment.
  • Evaluations included the Hamilton Rating Scale for Depression (Ham-D-17) and Clinical Global Impressions Scales (CGI-S, CGI-I).

Related Experiment Videos

  • Linear and logistic regression analyses were used to assess relationships between baseline severity and continuous/categorical outcome definitions.

    • Main Results:

    • Higher baseline depression and anxiety correlated with greater endpoint severity.
    • Lower baseline severity predicted greater improvement on CGI-I and percent change in HAM-D-17.
    • Lower baseline scores were significantly associated with a higher probability of being classified as a responder across all categorical definitions.

    Conclusions:

    • The definition of outcome significantly affects the strength and direction of observed relationships with predictive variables in antidepressant studies.
    • Methodological considerations regarding outcome definition are crucial for interpreting treatment study findings.