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QUESTION: Is the measles, mumps, and rubella (MMR) vaccine associated with autism in children?
Design
Population based cohort study with data obtained by database linkage.
Setting
Denmark.
Participants
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 …
Footnotes
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. kmm{at}dadlnet.dk
A modified version of this abstract appears in Evidence-Based Medicine.