title: Circadian variation in suicide attempts in Tokyo from 1978 to 1985.
abstract: Circadian variations in suicide attempts in Tokyo from 1978 to 1985 were analyzed on the basis of records of the Ambulance Service of Tokyo. A significant circadian variation in suicide attempts was demonstrated by the cosinor method, power spectrum analysis (by the maximum-entropy method), and analysis of variance. The peak time for suicide attempts was established by cosinor analysis as about 1800 hours (6:00 P.M.). The circadian variation in suicide attempts seemed to be associated with endogenous rhythms such as mood, as well as with daily variation in social activities.
authors.affiliation: Department of Public Health and Environmental Science, Faculty of Medicine, Tokyo Medical and Dental University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Motohashi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002940:Circadian Rhythm; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D013405:Suicide / Q000639:trends*; D013406:Suicide, Attempted / Q000639:trends*; D014041:Tokyo / Q000453:epidemiology