Oh! The data is from my DNA test I did. [23andme but you can use others]. You download the raw data and upload it to this site.
Where it gets the ADHD from is they sort through thousands of studies done with genetic links and do the math to see if you’re likely to have it or be prone to it, whatever ‘it’ is.
The scientists take people with ADHD and see what genes they have in common. Lots of scientists have done it. Sometimes they’re not sure if it’s ADHD or autism because some symptoms overlap.
It’s not definitive because it depends on the regular diagnosis first, which is done by regular doctors in the regular way.
But it’s something.