Edit: here it is - https://youtu.be/4_BIaLhdkrw which discusses https://link.springer.com/article/10.1007/s11469-019-00125-x
I'll edit this to say ADHD exhibits across the IQ spectrum. Smart people cope better and it makes it difficult for diagnosis.
Edit: here it is - https://youtu.be/4_BIaLhdkrw which discusses https://link.springer.com/article/10.1007/s11469-019-00125-x