Table 2.
Descriptive statistics for analysis variables, by intervention phase and condition
| Pre mean or % (SE) | Post mean or %(SE) | |||
|---|---|---|---|---|
| Intervention | Control | Intervention | Control | |
| Studenta demographics | ||||
| N of students | 7229 | 7108 | 3784 | 4590 |
| Gender (%) | ||||
| Male | 49.0 (0.7) | 48.7 (0.8) | 48.9 (1.1) | 49.4 (0.7) |
| Female | 51.1 (0.7) | 51.3 (0.8) | 51.1 (1.1) | 50.6 (0.7) |
| Non-white (%) | 27.6 (3.3) | 21.0 (3.4) | 30.0 (3.5) | 26.1 (3.3) |
| Students in school district eligible for free or reduced-price-lunch (mean %) | 46.5 (2.7) | 43.9 (3.9) | 49.4 (2.9) | 46.8 (3.5) |
| Non-white students in school district (mean %) | 26.0 (3.9) | 20.0 (5.0) | 26.4 (3.8) | 22.3 (4.1) |
| Student survey outcomes | ||||
| Alcohol (%) | ||||
| Current use | 45.7 (1.3) | 44.8 (1.4) | 42.4 (0.9) | 40.4 (2.1) |
| Current binge use | 28.0 (1.3) | 27.4 (1.4) | 25.8 (0.8) | 23.8 (1.5) |
| Perceived alcohol availability (% reporting alcohol would be “very easy” to get) | 54.6 (0.8) | 54.7 (0.8) | 49.2 (1.2) | 47.5 (1.1) |
| Perceptions of enforcement in neighborhood: | ||||
| Would be caught by police if drinking (% reporting “very much true” or “pretty much true”) | 22.9 (1.1) | 21.6 (1.2) | 25.1 (1.0) | 25.4 (1.6) |
| Would be asked for ID if purchasing alcohol (% reporting “very much true”) | 50.4 (1.6) | 49.7 (2.1) | 50.2 (1.5) | 48.4 (1.9) |
| Police would break up an underage drinking party (% reporting “very much true” or “pretty much true”) | 44.1 (1.5) | 43.0 (2.6) | 43.2 (2.2) | 43.4 (2.8) |
| Nobody over 21 would buy alcohol for minor (% reporting “very much true” or “pretty much true”) | 41.0 (1.3) | 41.5 (2.0) | 41.8 (2.0) | 39.7 (3.5) |
| Store characteristics | ||||
| N of purchase surveys conducted | 741 | 773 | 453 | 479 |
| Age of clerk (mean) | 37.1 (0.7) | 37.2 (0.6) | 38.5 (1.0) | 39.3 (0.8) |
| Number of clerks in store (mean) | 2.3 (0.1) | 2.3 (0.1) | 1.8 (0.1) | 2.0 (0.1) |
| Purchase outcomes | ||||
| Successful alcohol sale (%) | 22.9 (2.9) | 19.8 (2.6) | 7.1 (1.6) | 10.8 (2.6) |
a
All student data are for 11th grade students.
Note: Sample sizes are aggregated across all years of each intervention phase (i.e., pre- or post-intervention)