title: Chronotype differences in suicidal behavior and impulsivity among suicide attempters.
abstract: Morning- and evening-type individuals differ on a number of psychological and biological variables. There has been increasing interest in the relationship between chronotype and personality traits. The aim of this study was to investigate the relationship between impulsivity and chronotype in suicide attempters. Eighty-nine suicide attempters were included in the study, and systematic information on suicide attempts was recorded. The Morningness-Eveningness Questionnaire was applied to determine chronotype, and attempter impulsivity was measured by the total score of the Barratt Impulsiveness Scale. Significant differences between chronotype and impulsivity scores were found. Evening-type subjects reported significantly higher impulsivity scores than both neither- and morning-types. A significant association between chronotype and type of suicide attempt was detected. The largest proportion of violent suicide attempters were evening-type subjects. Violent suicide attempters also reported significantly higher impulsivity scores than nonviolent attempters. Previous studies have pointed out possible relations between eveningness and impulsivity. Current findings suggest that eveningness may be a risk factor for violent suicide attempts by increasing impulsivity.
authors.affiliation: Department of Psychiatry, Faculty of Medicine, Yuzuncu Yil University, Van, Turkey. dryavuzselvi@yahoo.com
authors.forename: Yavuz
authors.initials: Y
authors.lastname: Selvi
authors.forename: Adem
authors.initials: A
authors.lastname: Aydin
authors.forename: Abdullah
authors.initials: A
authors.lastname: Atli
authors.forename: Murat
authors.initials: M
authors.lastname: Boysan
authors.forename: Fatih
authors.initials: F
authors.lastname: Selvi
authors.forename: Lutfullah
authors.initials: L
authors.lastname: Besiroglu
mesh_terms: D005260:Female; D006801:Humans; D007175:Impulsive Behavior / Q000523:psychology*; D008297:Male; D011569:Psychiatric Status Rating Scales; D012307:Risk Factors; D013405:Suicide / Q000523:psychology*; D013406:Suicide, Attempted / Q000523:psychology*; D011795:Surveys and Questionnaires