Surdiagnostic du TDAH au Québec: Impact de l’âge d’entrée à l’école, différences régionales et coûts sociaux et économiques


In Quebec, children must be 5 years old before October1st to be admitted to kindergarten. In the same class, the youngest students are therefore up to one year younger than the oldest. In this study, the authors show that children born in late September have 35% higher rates of ADHD diagnosis and medication than those born in early October. ADHD would be confused with inattentive or more turbulent behaviors. Based on unpublished data from the RAMQ, including the medical services records of nearly 800,000 young people born between 1996 and 2005, the authors draw unequivocal conclusions about the extent of the phenomenon and sound the alarm on an issue of great concern.

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