Attention Deficit/Hyperactivity Disorder (ADHD) is a childhood-onset neurodevelopmental disorder. This condition can impair academic, social, and/or occupational functions. For these reasons, it is important to conduct surveillance of ADHD trends over time for the purpose of planning for healthcare services and resources. Yet, studies on the prevalence and incidence rates for ADHD in Canada have largely used case-finding algorithms applied to health administrative data that have not been adequately validated so it is unclear how accurate these algorithms are at detecting cases of ADHD.

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