They did look at this in their full report, although I agree that it's less evident from the summaries. See "Race and ethnicity interact with socioeconomic stat

They did look at this in their full report, although I agree that it's less evident from the summaries. See "Race and ethnicity interact with socioeconomic status to affect students’ likelihood of achieving and maintaining academic success" in the full report below. https://1gyhoq479ufd3yna29x7ubjn-wpengine.netdna-ssl.com/wp-content/uploads/Born_to_Win_Schooled_to_Lose.pdf#page=32 https://1gyhoq479ufd3yna29x7ubjn-wpengine.netdna-ssl.com/wp-...