Sociodemographic characteristics of the samples by grade level (entries are percentages, and SEs are in parentheses)
| Variable | 12th grade* | 10th grade† | 8th grade‡ |
|---|---|---|---|
| Female | 52.09 (1.13) | 49.38 (0.93) | 51.40 (0.75) |
| Non-Hispanic White | 52.88 (3.21) | 56.60 (2.90) | 45.78 (3.12) |
| Hispanic | 16.73 (2.66) | 15.86 (2.07) | 23.66 (2.66) |
| Non-Hispanic African-American | 15.13 (2.27) | 10.05 (1.57) | 14.24 (1.83) |
| At least one parent with college degree | 52.95 (2.33) | 60.85 (2.37) | 56.39 (2.07) |
Percentages for race/ethnicity do not add to 100% because smaller groups are not presented.
*n=4090 to 4275 (unweighted).
†n=4898 to 5219 (unweighted).
‡n=4780 to 4801, with exception n=4251 for parental education (unweighted).