Multiple sclerosis, timing of birth, birth order, sibling age gap and exposure to younger siblings

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Title Multiple sclerosis, timing of birth, birth order, sibling age gap and exposure to younger siblings
Author Broadley, Simon; Jackie, Deans; Stephen, Sawcer; S, Compston D Alastair
Publication Title Journal of Clinical Neuroscience
Editor Andrew Kaye
Year Published 2005
Place of publication Melbourne
Publisher Elsevier
Abstract Background: Recent studies have suggested associations between the risk of developing multiple sclerosis and timing of birth or exposure to younger siblings prior to the age of 6 years. Confirmation of such findings would provide evidence for an as yet unidentified birth-related environmental factor such as early childhood infection. Methods: As part of a national UK survey of autoimmune disease in families with multiple sclerosis we obtained nuclear family history details including date of birth for 571 case families and 351 control families. Diagnosis of multiple sclerosis was confirmed by personal review of cases using the Poser criteria. Results: No association was seen between month of birth and risk of multiple sclerosis when compared with controls and also with UK population data for the same period. Whilst a trend towards earlier birth order was seen in cases, this was not significant and was nullified by correction for latent disease in younger siblings. Mean age gap between affected siblings (n=53) was 5.9 years compared with 5.6 years in controls (P=0.44). There was no significant difference in sibship size between case and control families. Number of years exposed to younger infant siblings in the first 6 years of life showed no significant difference between cases and controls. Conclusions: These data suggest that risk of multiple sclerosis is not affected by season of birth or exposure to younger infant siblings, and therefore do not support a significant birth related environmental factor in susceptibility to this disease. These data are consistent with other studies.
Peer Reviewed No
Published Yes
ISBN 0967-5868
Conference name World Congress of Neurology
Location Sydney
Date From 2005-11-05
Date To 2005-11-11
URI http://hdl.handle.net/10072/9825
Date Accessioned 2006-01-31
Date Available 2007-03-12T08:18:10Z
Language en_AU
Research Centre Molecular Basis of Disease; Griffith Health Institute
Faculty Griffith Health Faculty
Subject Central Nervous System
Publication Type Conference Publications (Extract Paper)
Publication Type Code e3

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