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- Title
Intellectual Disability in a Birth Cohort: Prevalence, Etiology, and Determinants at the Age of 4 Years.
- Authors
Karam, Simone M.; Barros, aluísio J.D.; Matijasevich, alícia; dos Santos, Iná S.; anselmi, Luciana; Barros, Fernando; Leistner-Segal, Sandra; Félix, Têmis M.; Riegel, Mariluce; Maluf, Sharbel W.; Giugliani, Roberto; Black, Maureen M.
- Abstract
Background: Intellectual disability (ID), characterized by impairments in intellectual function and adaptive behavior, affects 1-3% of the population. Many studies investigated its etiology, but few are cohort studies in middle-income countries. Aims: To estimate prevalence, etiology, and factors related to ID among children prospectively followed since birth in a Southern Brazilian city (Pelotas). Methods: In 2004, maternity hospitals were visited daily and births were identified. Live-born infants (n = 4,231) whose family lived in the urban area have been followed for several years. At the age of 2 and 4 years, performances in development and intelligence tests were evaluated using the Battelle Developmental Inventory and Wechsler Intelligence Scale, respectively. Children considered as having developmental delay were invited to attend a genetic evaluation. Results: At 4 years of age, the prevalence of ID was 4.5%, and the etiology was classified into 5 groups: environmental (44.4%), genetic (20.5%), idiopathic (12.6%), neonatal sequelae (13.2%), other diseases (9.3%). Most children presented impairment in two or more areas of adaptive behavior. There was no difference in prenatal care attendance or maternal schooling among the groups. Conclusion: For about 40% of children, ID was attributed to nonbiological factors, suggesting that the rate may be reduced with appropriate interventions early in life.
- Subjects
INTELLECTUAL disabilities; COHORT analysis; ETIOLOGY of diseases; DISEASE prevalence; DEVELOPMENTAL delay
- Publication
Public Health Genomics, 2016, Vol 19, Issue 5, p290
- ISSN
1662-4246
- Publication type
Article
- DOI
10.1159/000448912