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Prevalence of seasonal depression in a prospective cohort study

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  1. Self-disorders in schizophrenia-spectrum disorders: a 5-year follow-up study

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  2. Investigation of previously implicated genetic variants in chronic tic disorders: a transmission disequilibrium test approach

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  1. Incidence Rates of Treated Mental Disorders in Childhood and Adolescence in a Complete Nationwide Birth Cohort

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  2. Verhaltenstherapie und psychopharmakologische Behandlung.

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The prevalence of autumn/winter seasonality in depression has been documented in the longitudinal Zurich cohort study by five comprehensive diagnostic interviews at intervals over more than 20 years (N = 499). Repeated winter major depressive episodes (MDE-unipolar + bipolar) showed a prevalence of 3.44% (5× more women than men), whereas MDE with a single winter episode was much higher (9.96%). A total of 7.52% suffered from autumn/winter seasonality in major and minor depressive mood states. The clinical interviews revealed novel findings: high comorbidity of Social Anxiety Disorder and Agoraphobia within the repeated seasonal MDE group, high incidence of classic diurnal variation of mood (with evening improvement), as well as a high rate of oversensitivity to light, noise, or smell. Nearly twice as many of these individuals as in the other MDE groups manifested the syndrome of atypical depression (DSM-V), which supports the prior description of seasonal affective disorder (SAD) as presenting primarily atypical symptoms (which include hypersomnia and increase in appetite and weight). This long-term database of regular structured interviews provides important confirmation of SAD as a valid diagnosis, predominantly found in women, and with atypical vegetative symptoms.

Original languageEnglish
JournalEuropean Archives of Psychiatry and Clinical Neuroscience
Number of pages8
ISSN0003-9373
DOIs
Publication statusPublished - 1 Oct 2019

ID: 57356583