Table 1.
Descriptive Statistics for School- and Individual-Level Covariates (n = 18,924).
| Covariates | Mean | (Standard deviation) | Frequency (%) |
|---|---|---|---|
| School-Level Covariates | |||
| Size of student bodya | |||
| ≤125 | 3.32 | ||
| 126–350 | 8.90 | ||
| 351–775 | 24.68 | ||
| ≥776 | 63.09 | ||
| Percent whitea | |||
| Zero % | 2.18 | ||
| 1%–66% | 54.51 | ||
| 67%–93% | 43.02 | ||
| 94%–100% | 0.29 | ||
| Private school | 7.72 | ||
| Region | |||
| Northeast | 14.60 | ||
| Midwest | 23.76 | ||
| South | 37.06 | ||
| West | 24.58 | ||
| Location | |||
| Urban | 29.51 | ||
| Suburban | 53.96 | ||
| Rural | 16.53 | ||
| High school and feeder school same | 24.26 | ||
| Proportion living with two bio parents | 0.505 | 0.118 | |
| Individual-Level Covariates | |||
| Age | 16.186 | 1.712 | |
| Female | 50.91 | ||
| Race/ethnicity | |||
| White | 50.97 | ||
| African American | 21.70 | ||
| Hispanic | 17.07 | ||
| Asian | 7.32 | ||
| Other/multiracial | 2.85 | ||
| Live with both bio parents | 53.33 | ||
| Mother’s Employment | |||
| Mother out of labor force | 28.22 | ||
| Mother works 1–29 hours/week | 11.55 | ||
| Mother works 30+ hours/week | 60.23 | ||
| Parent’s Highest Education | |||
| Less than high school | 13.19 | ||
| High school graduate | 29.67 | ||
| Some higher education | 21.13 | ||
| College graduate | 23.51 | ||
| Post-college degree-earner | 12.51 | ||
| Strong desire to move from neighborhood | 15.27 | ||
| Problems in neighborhood | 0.420 | 0.410 | |
| Number other minor household members | 2.070 | 1.314 | |
| Has any functional limitation | 4.63 | ||
| Individual stress | 7.324 | 5.995 | |
| Early puberty (age standardized) | 15.05 | ||
| Athlete | 56.87 |
a
Categorizations mirror those used by Add Health staff in the creation of the school-level weights.