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Prospective Cohort Study of Vitamin D and Autism Spectrum Disorder Diagnoses in Early Childhood
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- Author(s): Ali, Yamna; Anderson, Laura N.; Smile, Sharon; Chen, Yang; Borkhoff, Cornelia M.; Koroshegyi, Christine; Lebovic, Gerald; Parkin, Patricia C.; Birken, Catherine S.; Szatmari, Peter; Maguire, Jonathon L.
- Language:
English- Source:
Autism: The International Journal of Research and Practice. Apr 2019 23(3):584-593.- Publication Date:
2019- Document Type:
Journal Articles
Reports - Research - Language:
- Additional Information
- Availability: SAGE Publications. 2455 Teller Road, Thousand Oaks, CA 91320. Tel: 800-818-7243; Tel: 805-499-9774; Fax: 800-583-2665; e-mail: [email protected]; Web site: http://sagepub.com
- Peer Reviewed: Y
- Source: 10
- Subject Terms:
- Subject Terms:
- Accession Number: 10.1177/1362361318756787
- ISSN: 1362-3613
- Abstract: Several studies have suggested an association between vitamin D in childhood and autism spectrum disorder. No prospective studies have evaluated whether lower vitamin D levels precede ASD diagnoses -- a necessary condition for causality. The objective of this study was to prospectively evaluate whether vitamin D serum levels in early childhood was associated with incident physician diagnosed ASD. A prospective cohort study was conducted using data from preschool-aged children in the TARGet Kids! practice-based research network in Toronto, Canada, from June 2008 to July 2015. 25-hydroxyvitamin D concentration was measured through blood samples and vitamin D supplementation from parent report. Autism spectrum disorder diagnosis was determined from medical records at follow-up visits. Covariates included age, sex, family history of autism spectrum disorder, maternal ethnicity, and neighborhood household income. Unadjusted and adjusted relative risks and 95% confidence intervals were estimated using Poisson regression with a robust error variance. In this study, 3852 children were included. Autism spectrum disorder diagnosis was identified in 41 children (incidence = 1.1%) over the observation period (average follow-up time = 2.5 years). An association between 25-hydroxyvitamin D concentration and autism spectrum disorder was not identified in the unadjusted (relative risk = 1.04, 95% confidence interval: 0.97, 1.11 per 10 nmol/L increase in 25-hydroxyvitamin D concentration) or adjusted models (adjusted relative risk = 1.06; 95% confidence interval: 0.95, 1.18). An association between vitamin D supplementation in early childhood and autism spectrum disorder was also not identified (adjusted relative risk = 0.86, 95% confidence interval: 0.46, 1.62). Vitamin D in early childhood may not be associated with incident physician diagnoses of autism spectrum disorder.
- Abstract: As Provided
- Publication Date: 2019
- Accession Number: EJ1212183
- Availability:
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