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The perceived average age of onset of ADHD ranges from 5.2 years in France to 7.3 years in Spain (Figure).1 However, both DSM-IV and ICD-10 diagnostic criteria specify that some symptoms of ADHD must be present in the patient before the age of 7 years. Therefore, the perceived average age of onset may be greater than the age at initial symptom occurrence.1

Perceived average age of onset of ADHD in Europe and the USA. Reproduced with permission from Datamonitor.1
Reference:
1. Datamonitor, Stakeholder insight: ADHD. Prescriber attention still held by short acting stimulant drugs. DMHC2008. 2004.