Attention Deficit Hyperactivity Disorder is a fairly common disorder, typically identified in childhood. The exact prevalence rate is an issue of some debate, and studies vary considerably in their estimates Willcutt. Polanczyk et al. conducted a comprehensive review of ADHD prevalence studies from around the world published between 1985 to 2012. They found no evidence of an increase in the number of children in the population who meet criteria for ADHD when standardized diagnostic procedures are followed. Average prevalence across time and around the world was found to be approximately 7%.
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