NEDSACNational Epidemiologic Database for the Study of Autism in Canada (Kingston, Ontario, Canada)
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NEDSAC contains the date of birth and sex of all children identified by participating agencies in the surveillance regions.
For the current analysis, we included children identified for NEDSAC from the time data collection began (2002 in Manitoba and PEI; 2003 in Southeastern Ontario and Newfoundland and Labrador) up until May 2007, who: 1) were first diagnosed with autistic disorder, PDD-NOS, Asperger's disorder, or a non-specific diagnosis of autism spectrum disorder between 1997 and 2005, inclusive, and whose month of diagnosis was known; and 2) were born in one of the surveillance regions and still living there in the year when diagnosed, or, if they were born elsewhere, diagnosed either in the same year they moved to the surveillance region or in a subsequent year.
NEDSAC does not contain information on children who moved from the surveillance regions before data collection began in 2002/2003.