TABLE 1.
Frequency and prevalence distribution of study samples by explanatory variables in 1994–1995
| Explanatory variables (n = 7,966) | n | Prevalence (%) |
|---|---|---|
| Gender | ||
| Males | 3,679 | 46.2 |
| Females | 4,287 | 53.8 |
| Grade | ||
| Grade 6 | 10 | 0.1 |
| Grade 7 | 1,229 | 15.4 |
| Grade 8 | 1,192 | 14.0 |
| Grade 9 | 1,620 | 20.3 |
| Grade 10 | 1,812 | 22.7 |
| Grade 11 | 1,674 | 21.0 |
| Grade 12 | 380 | 4.8 |
| Race | ||
| White | 3,822 | 48.0 |
| Hispanic | 1,399 | 17.6 |
| Black | 1,421 | 17.8 |
| Asian | 533 | 6.7 |
| Native American | 79 | 1.0 |
| Other | 712 | 8.9 |
| Mean | Range | |
| School size (number of students/100) | 8.9 | Min.: 0.3, Max.: 25.6 |
| Social network variables | n | Prevalence (%) |
| Group integration | ||
| Outside school friends | ||
| No | 4,440 | 55.7 |
| Yes | 3,526 | 44.3 |
| Grade heterogeneity group | ||
| Low | 2,737 | 34.4 |
| Medium | 3,392 | 42.6 |
| High | 1,594 | 20.0 |
| Prestige | ||
| Bonacich centrality | ||
| Low | 1,503 | 18.9 |
| Medium | 5,072 | 63.7 |
| High | 1,391 | 17.5 |
| Density | ||
| Egocentric density | ||
| Low | 708 | 8.9 |
| Medium | 5,870 | 73.7 |
| High | 1,145 | 14.4 |
| Socialization with substance-using peers | ||
| Alcohol-using friend | ||
| No | 3,730 | 46.8 |
| Yes | 4,108 | 51.6 |