Table 1 Socioeconomic indicators for the US schools involved in the study
IndicatorMean (range) of surveyed schools, weighted by number of surveyed students per schoolState mean
Eligible for hot lunch or subsidised lunch programme (%)48 (43–59)47
Special education (%)13 (10–14)11
Spending per student (US$)7812 (7037–8551)8818
Attendance rate (%)9596
White (%)60 (48–68)36
African–American (%)26 (24–30)14
Hispanic (%)13 (7–21)46
Other (%)<1<1