WHAT CORRELATES WITH ACADEMIC ACHIEVEMENT AS SHOWN IN THE RESEARCH?
Excellent work. Socioeconomic status, which includes both choices voted for here and excludes the choices not selected, is what correlates with student achievement as shown in the research.
To those who claim we need to educate these kids out of poverty (I'm looking at you Obama, Duncan, Gates, Rhee, DFER, Guggenheim, Canada, and the rest) I say, enough already.
Here's some data to back this up from Stephen Krashen:
Protecting Students