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Population based cohort study with data obtained by database linkage.
537 303 children (51% boys).
Assessment of risk factors
MMR vaccination status was obtained from the Danish National Board of Health (compiled by general practitioner reports). Data on birth weight, sex, gestational age, family socioeconomic status, and mother’s education were also collected.
Main outcome measures
Children’s autism status was obtained from the Danish Psychiatric Central Register; diagnoses of autistic disorder or another autistic spectrum disorder were assigned by specialists in child psychiatry. If a child was diagnosed with both autistic disorder and ≥1 other autistic …
Sources of funding: Danish National Research Foundation, National Vaccine Program Office and National Immunization Program, and National Alliance for Autism Research.
For correspondence: Dr K M Madsen, Danish Epidemiology Science Center, Department of Epidemiology and Social Medicine, Århus, Denmark.
A modified version of this abstract appears in Evidence-Based Medicine.