title: Etiological survey on intellectual disability in the northern Finland birth cohort 1986.
abstract: The etiology of intellectual disability was studied both in incident (n = 9,432) and prevalent (n = 9,351) populations in a one-year birth cohort born in Northern Finland in 1985-1986. Data from multiple sources were used to follow the children until the age of 11.5 years. Of the incident cases (n=119) with intellectual disabilities, 66.4% had etiologically biomedical associative factor. Paranatal factors were relatively fewer and prenatal more common compared with earlier studies. We found nearly double the prevalence of genetic factors leading to intellectual disabilities compared with a contemporary study from Norway. The differences between the populations, despite random variation, some dissimilarities between etiological categorization and diagnostic accuracy, are in most part due to true differences between the study populations and genetic pool.
authors.affiliation: Public Health Science and General Practice, University of Oulu, Oulu 90014, Finland. ulla.heikura@oulu.fi
authors.forename: Ulla
authors.initials: U
authors.lastname: Heikura
authors.forename: Sirkka-Liisa
authors.initials: SL
authors.lastname: Linna
authors.forename: Päivi
authors.initials: P
authors.lastname: Olsén
authors.forename: Anna-Liisa
authors.initials: AL
authors.lastname: Hartikainen
authors.forename: Anja
authors.initials: A
authors.lastname: Taanila
authors.forename: Marjo-Riitta
authors.initials: MR
authors.lastname: Järvelin
mesh_terms: D002391:Catchment Area, Health; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D005260:Female; D005387:Finland / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D008607:Intellectual Disability / Q000453:epidemiology / Q000208:ethnology* / Q000209:etiology*; D008297:Male; D015995:Prevalence; D011446:Prospective Studies; D011795:Surveys and Questionnaires