5 ms·

They controlled for this. "Participants were roughly the same age — 18 to 25 — with comparable body mass index and educational levels."

• SomeStupidPoint 10y ago
  Not to discredit them, because it's a hard problem, but it isn't a full control: even on a college campus (or looking at alumni) and controlling for weight, running and instrument training would still be proxies for various things about upbringing or current social status, and could account for the effects by selection bias. That said, I think this is introductory work on the topic and definitely justifies further inquiry.
  • danaliv 10y ago
    You're right; "control" may be too strong a word. In any case, they did at least consider it. :)