It’s interesting how science can become closer to pseudoscience than proper research through paper-milling.
It seems like that with such small groups and effects you could run the same “study” again and again until you get the result that you initially desired.
It's very easy to find studies that prove that Adderall (etc.) improve non-ADHD people's cognition ability. And it's equally easy to find studies that prove otherwise. The parent comment is very spot on. You can find evidence supporting anything nowadays.
It seems like that with such small groups and effects you could run the same “study” again and again until you get the result that you initially desired.