>... confounding the results that the studies should account for... You're absolutely right that studies should make sure to control for potentially important

>... confounding the results that the studies should account for... You're absolutely right that studies should make sure to control for potentially important variables. I don't know which studies you referring to. Not a topic I've looked at. That said, criticising a second group of studies can't reasonably cast shade over the first group, if that was your implication.