Tbh ya all don’t need to panic like that. While the finding appears to be sound what it does not tell is what happens in the cohort in 5/10/15 years. It is possible that an adult diagnosis of ADHD may only lead to an earlier onset and that the rest of the cohort will develop it in the same ratio. Until the cohort is not all through it doesn’t really say anything.

Besides they appear to have excluded anyone who was already diagnosed with ADHD to begin with and only assessed people who were diagnosed as adult.