J Chotai1, T Forsgren, L G Nilsson, R Adolfsson. 1. Division of Psychiatry, Department of Clinical Sciences, University of Umeå, Sweden. jayanti.chotai.us@vll.se
Abstract
BACKGROUND: Since several studies show season of birth variations in morbidity, suicidal behavior and CSF (cerebrospinal fluid) monoamine metabolites, we investigated season of birth variations in personality in the population. METHODS: We analyzed by multiple logistic regressions the Temperament and Character Inventory (TCI) for 2,130 individuals taking part in the Betula prospective random cohort study of Umeå, Sweden. RESULTS: The personality dimensions were correlated significantly with age and gender. We stratified the data according to age, gender and the season of TCI measurement. By the median split in each stratum, a high-value group and a low-value group were obtained for each of the personality dimensions. Those born during February to April were significantly more likely than those born during October to January to have high NS (novelty seeking) among women, particularly the subscale NS2 (impulsiveness vs. reflection), and to have high PS (persistence) among men. Temperament profiles also showed season of birth variations. CONCLUSIONS: We discuss the associations in the literature between personality and the monoamines serotonin and dopamine, and suggest that our results are compatible with a hypothesis of season of birth variation in the monoamine turnover. The personality traits are likely to be influenced by several genetic and environmental factors, one of them being the season of birth. Copyright 2001 S. Karger AG, Basel.
BACKGROUND: Since several studies show season of birth variations in morbidity, suicidal behavior and CSF (cerebrospinal fluid) monoamine metabolites, we investigated season of birth variations in personality in the population. METHODS: We analyzed by multiple logistic regressions the Temperament and Character Inventory (TCI) for 2,130 individuals taking part in the Betula prospective random cohort study of Umeå, Sweden. RESULTS: The personality dimensions were correlated significantly with age and gender. We stratified the data according to age, gender and the season of TCI measurement. By the median split in each stratum, a high-value group and a low-value group were obtained for each of the personality dimensions. Those born during February to April were significantly more likely than those born during October to January to have high NS (novelty seeking) among women, particularly the subscale NS2 (impulsiveness vs. reflection), and to have high PS (persistence) among men. Temperament profiles also showed season of birth variations. CONCLUSIONS: We discuss the associations in the literature between personality and the monoaminesserotonin and dopamine, and suggest that our results are compatible with a hypothesis of season of birth variation in the monoamine turnover. The personality traits are likely to be influenced by several genetic and environmental factors, one of them being the season of birth. Copyright 2001 S. Karger AG, Basel.
Authors: N K Shuman; I Krug; M Maxwell; A Poyastro Pinheiro; T Brewerton; L M Thornton; W H Berrettini; H Brandt; S Crawford; S Crow; M M Fichter; K A Halmi; C Johnson; A S Kaplan; P Keel; M Lavia; J Mitchell; A Rotondo; M Strober; D Blake Woodside; W H Kaye; C M Bulik Journal: Eat Weight Disord Date: 2010-09 Impact factor: 4.652
Authors: Jurjen J Luykx; Steven C Bakker; Eef Lentjes; Marco P M Boks; Nan van Geloven; Marinus J C Eijkemans; Esther Janson; Eric Strengman; Anne M de Lepper; Herman Westenberg; Kai E Klopper; Hendrik J Hoorn; Harry P M M Gelissen; Julian Jordan; Noortje M Tolenaar; Eric P A van Dongen; Bregt Michel; Lucija Abramovic; Steve Horvath; Teus Kappen; Peter Bruins; Peter Keijzers; Paul Borgdorff; Roel A Ophoff; René S Kahn Journal: PLoS One Date: 2012-02-01 Impact factor: 3.240