title: Seasonality prevalence and incidence of depressive disorder in a general practice sample: identifying differences in timing by caseness.
abstract: A total of 2225 consecutive consulting general practice patients attending a North London Health Centre over the course of a year were screened and interviewed for the presence of psychiatric disorder using the GHQ and SADS; 196 patients suffering from RDC depressive disorders were identified and followed up for a further 12 months. A difference in prevalence incidence and recovery time was identified between major and minor depression. Various associations between season of onset and a range of variables were observed. Logistic modelling identified interactions between some of these variables some of which have not been explored in previous studies.
authors.affiliation: Gwaynten Unit, City Hospital, Truro, Cornwall, UK.
authors.forename: C V
authors.initials: CV
authors.lastname: Blacker
authors.forename: J M
authors.initials: JM
authors.lastname: Thomas
authors.forename: C
authors.initials: C
authors.lastname: Thompson
mesh_terms: D001714:Bipolar Disorder / Q000175:diagnosis / Q000453:epidemiology* / Q000235:genetics; D003430:Cross-Sectional Studies; D003866:Depressive Disorder / Q000175:diagnosis / Q000453:epidemiology* / Q000235:genetics; D004739:England / Q000453:epidemiology; D005194:Family Practice / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D010348:Patient Care Team / Q000706:statistics & numerical data*; D012008:Recurrence; D016574:Seasonal Affective Disorder / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics; D012621:Seasons; D013577:Syndrome