Document Detail

Variation in season of birth in singleton and multiple births concordant for autism spectrum disorders.
MedLine Citation:
PMID:  18298692     Owner:  NLM     Status:  MEDLINE    
Patterns of seasonal variation in births in some neuropsychiatric conditions have been found in previous research; however, no study to date has examined these disorders for seasonal variation in singletons and multiple births separately. This study aimed to determine whether the birth date distribution for individuals with autism spectrum disorders (ASD), including singletons and multiple births, differed from the general population. Two ASD case groups were studied: 907 singletons and 161 multiple births concordant for ASD. Two control groups were obtained from registered births of singletons and multiples. Results of the non-parametric time-series analyses, where day of birth was used, suggested there were three peaks in ASD singletons and ASD concordant multiple births. Roughly, the peaks were in April, June and October for singletons and about 2-4 weeks earlier in multiples. Results from multivariable Poisson regression, where month of birth was used, indicated that ASD concordant multiple births in males tended to be higher than expected in March, May and September (with borderline statistical significance), but were 87% less in December (P < 0.05), as compared with January. Overall, the patterns of relative risk estimates from Poisson regression are similar to findings from the non-parametric time-series approach, but are not exactly congruent. It is important to note that indications of seasonality may be sensitive to the selection of time cut-points and therefore an arbitrary binning of time can either mask existing trends or falsely indicate the presence of a trend. The presence of seasonal trends in ASD singletons and concordant multiple births suggests a role for non-heritable factors operating during the pre- or perinatal period, even among cases with a genetic susceptibility.
Li-Ching Lee; Craig J Newschaffer; Justin T Lessler; Brian K Lee; Rashmi Shah; Andrew W Zimmerman
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Paediatric and perinatal epidemiology     Volume:  22     ISSN:  1365-3016     ISO Abbreviation:  Paediatr Perinat Epidemiol     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-26     Completed Date:  2008-05-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8709766     Medline TA:  Paediatr Perinat Epidemiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  172-9     Citation Subset:  IM    
Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Autistic Disorder* / etiology
Birth Rate / trends*
Multiple Birth Offspring
Multivariate Analysis
Poisson Distribution
Sex Distribution
Grant Support
MH64547/MH/NIMH NIH HHS; U10/CCU320408-05//PHS HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Active and passive maternal smoking during pregnancy and the risks of low birthweight and preterm bi...
Next Document:  Screening for developmental problems at primary care level: a field programme in San Isidro, Argenti...