PMID: 11329398May 1, 2001Paper

Season of birth among patients with schizophrenia and their siblings: evidence for the procreational habits hypothesis

The American Journal of Psychiatry
J M SuvisaariJ K Lönnqvist

Abstract

The birth rate of patients with schizophrenia during the winter and spring months is 5%-8% higher worldwide than the birth rate of the general population in the winter and spring months. Seasonal variation of births among the unaffected siblings of patients with schizophrenia has not been studied with adequate sample sizes. The authors investigated the seasonal variation of births among siblings of patients with schizophrenia in a large, nationwide, representative patient and sibling population. Finnish patients with schizophrenia born from 1950 to 1969 (N=15,389) were identified from three nationwide health care registers. Unaffected siblings of these patients born in the same time period (N=37,819) were identified from the Finnish National Population REGISTER: The seasonal variation of births among patients and siblings were examined by using a log-linear model. Explanatory variables were sex, year of birth categorized into four 5-year groups, and seasonal variation, which was analyzed by fitting a short Fourier series to the monthly birth data. The odds for having been born during the winter-spring months were slightly higher among both siblings and patients in all birth-year groups. However, patients born from 1955 to 1959 ...Continue Reading

Citations

Sep 29, 2007·European Archives of Psychiatry and Clinical Neuroscience·Edda PjrekSiegfried Kasper
Dec 23, 2003·Neuroscience Research·Mamoru TochigiTsukasa Sasaki
Aug 19, 2003·Progress in Neuro-psychopharmacology & Biological Psychiatry·A Carlo AltamuraEmanuela Mundo
Apr 13, 2012·PloS One·Giulio DisantoSreeram V Ramagopalan
Aug 4, 2012·PloS One·Soumya MazumdarPeter Bearman
Jan 7, 2011·Journal of Psychiatric Research·Alex S Cohen, Gina M Najolia
Aug 3, 2007·Psychiatry Research·Vincenzo NataleJayanti Chotai
Jan 23, 2013·Neuropathology and Applied Neurobiology·G C DeLucaG C Ebers
Jan 23, 2003·International Journal of Health Geographics·Markus Fritzsche
Mar 14, 2021·Acta Psychiatrica Scandinavica·Antti TanskanenJari Tiihonen

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