@naneko @jeffcliff >If circumcision wasn't causing it, I doubt a needle poke would.

I disagree, simply because the needle pokes happen when you're old enough to remember them. Given that it's a very young kid...I agree, it's outlandish, but parents in the 1950s would've said that the psychological impact of spanking was relatively small as well.

>Single mother households?

This tracks the data reasonably. I'd buy it as a possible candidate.