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Age-specific prevalence of intellectual disability in Finland at the beginning of new millennium - multiple register method.
MedLine Citation:
PMID:  23336674     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: In the national study of multiple registers in 2000, the average prevalence of intellectual disability (ID) was 0.70%, with marked differences by age group (range 0.38-0.96%) - what are these differences in detail, and can they be understood? METHOD: This study was based on two national health registers and six social benefit registers. Prevalence of ID was calculated by 1-year age cohorts. RESULTS: The multiple register prevalence of ID increased steadily from 0.20% in the first life year to 0.74% (male: 0.90%, female: 0.58%) at 10 years. For boys, the rate fell to 0.71% at 11 years. For both sexes, a steady increase was noted in the distribution up to 40 years (male: 0.84%, female: 0.73%), followed by a sharper increase to the maximum prevalence (male: 1.19% at 48 years, female: 1.05% at 50 years). At the pension age of 66 years, a sudden drop to 0.49% occurred for men and women. Different registers gave very different age distributions. CONCLUSIONS: By examining the data by 1-year age cohorts, and by understanding the role of each register, it could be deduced that a proportion of cases in younger age groups is lacking, and a remarkable proportion of elderly ID persons is missing from the pooled data. The findings were more difficult to interpret, if the data were grouped into bigger age groups.
Authors:
H Westerinen; M Kaski; L J Virta; F Almqvist; M Iivanainen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-21
Journal Detail:
Title:  Journal of intellectual disability research : JIDR     Volume:  -     ISSN:  1365-2788     ISO Abbreviation:  J Intellect Disabil Res     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9206090     Medline TA:  J Intellect Disabil Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 The Authors. Journal of Intellectual Disability Research © 2013 Blackwell Publishing Ltd.
Affiliation:
Department of Child Psychiatry, Hospital of Children and Adolescents, University of Helsinki, Helsinki, Finland.
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