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. 2006 Jan 6;14(2):82–91. doi: 10.1002/mpr.19

Testing atypical depression definitions

Franco Benazzi 1,✉
PMCID: PMC6878544  PMID: 16175877

Abstract

The evidence supporting the DSM‐IV definition of atypical depression (AD) is weak. This study aimed to test different definitions of AD. Major depressive disorder (MDD) patients (N = 254) and bipolar‐II (BP‐II) outpatients (N = 348) were interviewed consecutively, during major depressive episodes, with the Structured Clinical Interview for DSM‐IV. DSM‐IV criteria for AD were followed. AD validators were female gender, young onset, BP‐II, axis I comorbidity, bipolar family history. Frequency of DSM‐IV AD was 43.0%. AD, versus non‐AD, was significantly associated with all AD validators, apart from comorbidity when controlling for age and sex. Factor analysis of atypical symptoms found factor 1 including oversleeping, overeating and weight gain (leaden paralysis at trend correlation), and factor 2 including interpersonal sensitivity, mood reactivity, and leaden paralysis. Multiple logistic regression of factor 1 versus AD validators found significant associations with several validators (including bipolar family history), whereas factor 2 had no significant associations.

Findings may support a new definition of AD based on the state‐dependent features oversleeping and overeating (plus perhaps leaden paralysis) versus the current AD definition based on a combination of state and trait features. Pharmacological studies are required to support any new definition of AD, as the current concept of AD is based on different response to TCA antidepressants versus non‐AD. Copyright © 2005 Whurr Publishers Ltd.

Keywords: atypical depression, atypical features, bipolar II disorder, DSM‐IV

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