“Whereas it was previously thought that children eventually outgrow ADHD, recent studies suggest that 30–60% of affected individuals continue to show significant symptoms of the disorder into adulthood.”
Source: British Medical Journal
adc.bmj.com/content/90/suppl_1/i2
Time and time again I see parents either misconstruing the information being given or perhaps they’re being given the wrong information entirely, I haven’t figured out which.
A cursory glance at the Lancet or BMJ would prove otherwise. The exact figures vary depending on which studies you read. As far as I’m aware there haven’t been any large scale studies that have tracked patients over say a 20 year period, these would be key in determining long term outcomes.
To summarise; the remaining 20% you’re referring to still have ADHD. Only their symptoms are so insignificant that they’d likely not meet the DSM criteria for a new dx.
That doesn’t mean they’re magically cured of ADHD, just that they’ve perhaps become better at managing their symptoms or the natural developmental changes that occur throughout the teen years into adulthood have had some impact on the brain. —The studies don’t outline the reasons for improvement.
I have researched this to the hilt with two currently undiagnosed ADHD daughters and being ADHD myself!