Month of birth and mortality in Sweden: a nation-wide population-based cohort study.

<h4>Background</h4>Month of birth--an indicator for a variety of prenatal and early postnatal exposures--has been associated with life expectancy in adulthood. On the northern hemisphere, people born in the autumn live longer than those born during the spring. Only one study has followed...

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Autores principales:	Peter Ueda, Anna-Karin Edstedt Bonamy, Fredrik Granath, Sven Cnattingius
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1081834d1b85480d803122067566701a
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spelling	oai:doaj.org-article:1081834d1b85480d803122067566701a2021-11-18T07:57:19ZMonth of birth and mortality in Sweden: a nation-wide population-based cohort study.1932-620310.1371/journal.pone.0056425https://doaj.org/article/1081834d1b85480d803122067566701a2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23457566/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Month of birth--an indicator for a variety of prenatal and early postnatal exposures--has been associated with life expectancy in adulthood. On the northern hemisphere, people born in the autumn live longer than those born during the spring. Only one study has followed a population longitudinally and no study has investigated the relation between month of birth and mortality risk below 50 years.<h4>Methods and results</h4>In this nation-wide Swedish study, we included 6,194,745 subjects, using data from population-based health and administrative registries. The relation between month of birth (January-December) and mortality risk was assessed by fitting Cox proportional hazard regression models using attained age as the underlying time scale. Analyses were made for ages >30, >30 to 50, >50 to 80 and >80 years. Month of birth was a significant predictor of mortality in the age-spans >30, >50 to 80, and >80 years. In models adjusted for gender and education for ages >30 and >50 to 80 years, the lowest mortality was seen for people born in November and the highest mortality in those born in the spring/summer, peaking in May for mortality >30 years (25‰ excess hazard ratio compared to November, [95% confidence interval = 16-34 ]) and in April for mortality >50 to 80 years (42‰ excess hazard ratio compared to November, [95% confidence interval = 30-55]). In the ages >80 years the pattern was similar but the differences in mortality between birth months were smaller. For mortality within the age-span >30 to 50 years, results were inconclusive.<h4>Conclusion</h4>Month of birth is associated to risk of mortality in ages above 50 years in Sweden. Further studies should aim at clarifying the mechanisms behind this association.Peter UedaAnna-Karin Edstedt BonamyFredrik GranathSven CnattingiusPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 2, p e56425 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Peter Ueda Anna-Karin Edstedt Bonamy Fredrik Granath Sven Cnattingius Month of birth and mortality in Sweden: a nation-wide population-based cohort study.
description	<h4>Background</h4>Month of birth--an indicator for a variety of prenatal and early postnatal exposures--has been associated with life expectancy in adulthood. On the northern hemisphere, people born in the autumn live longer than those born during the spring. Only one study has followed a population longitudinally and no study has investigated the relation between month of birth and mortality risk below 50 years.<h4>Methods and results</h4>In this nation-wide Swedish study, we included 6,194,745 subjects, using data from population-based health and administrative registries. The relation between month of birth (January-December) and mortality risk was assessed by fitting Cox proportional hazard regression models using attained age as the underlying time scale. Analyses were made for ages >30, >30 to 50, >50 to 80 and >80 years. Month of birth was a significant predictor of mortality in the age-spans >30, >50 to 80, and >80 years. In models adjusted for gender and education for ages >30 and >50 to 80 years, the lowest mortality was seen for people born in November and the highest mortality in those born in the spring/summer, peaking in May for mortality >30 years (25‰ excess hazard ratio compared to November, [95% confidence interval = 16-34 ]) and in April for mortality >50 to 80 years (42‰ excess hazard ratio compared to November, [95% confidence interval = 30-55]). In the ages >80 years the pattern was similar but the differences in mortality between birth months were smaller. For mortality within the age-span >30 to 50 years, results were inconclusive.<h4>Conclusion</h4>Month of birth is associated to risk of mortality in ages above 50 years in Sweden. Further studies should aim at clarifying the mechanisms behind this association.
format	article
author	Peter Ueda Anna-Karin Edstedt Bonamy Fredrik Granath Sven Cnattingius
author_facet	Peter Ueda Anna-Karin Edstedt Bonamy Fredrik Granath Sven Cnattingius
author_sort	Peter Ueda
title	Month of birth and mortality in Sweden: a nation-wide population-based cohort study.
title_short	Month of birth and mortality in Sweden: a nation-wide population-based cohort study.
title_full	Month of birth and mortality in Sweden: a nation-wide population-based cohort study.
title_fullStr	Month of birth and mortality in Sweden: a nation-wide population-based cohort study.
title_full_unstemmed	Month of birth and mortality in Sweden: a nation-wide population-based cohort study.
title_sort	month of birth and mortality in sweden: a nation-wide population-based cohort study.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/1081834d1b85480d803122067566701a
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Month of birth and mortality in Sweden: a nation-wide population-based cohort study.

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