What sort of parenting matters

The worth-checking-in-with-daily Joanne Jacobs links to a study that throws alot of assumptions into the ashcan!
joannejacobs.com: What sort of parenting matters
Briefly, here's the stuff that matters and that doesn't matter:
Matters: The child has highly educated parents.
Doesn't: The child regularly watches TV at home.
Matters: The child's parents have high income.
Doesn't: The child's mother didn't work between birth and kindergarten.
Matters: The child's parents speak English in the home.
Doesn't: The child's parents regularly take him to museums.
Matters: The child's mother was 30 or older at time of the child's birth.
Doesn't: The child attended Head Start.

I can hear the PC crowd now! Doesn't matter if the kid watches TV at home, doesn't matter if the kids parents take him to museums, doesn't matter if the kid attended head start.
But I want it to matter!