That's about what I read into it, too.

I really liked Val's meta-study link. Haven't had a chance to look at that one completely, but the other thing that I'd suggest is that MOST study participants are probably coming from a place where home environments are likely to be more-or-less idealized, or at least "good."

Horrible homes seldom offer to become research study participants. KWIM?

Schrödinger's cat walks into a bar. And doesn't.