Table 3 Distribution of schools, school classes and students, as well as cluster sizes overall and by intervention groups
From: Berlin evaluates school tobacco prevention - BEST prevention: study design and methodology
Overall | Student intervention | Student-parent intervention | Control group | |
|---|---|---|---|---|
Total schools | 47 | 17 (36%) | 16 (34%) | 14 (30%) |
Integrated secondary school | 32 | 11 (34%) | 11 (34%) | 10 (31%) |
Gymnasium | 15 | 6 (40%) | 5 (33%) | 4 (27%) |
School classes | 161 | 62 (42%) | 58 (31%) | 41 (27%) |
Students | 2801* | 1142 (41%) | 980 (35%) | 679 (24%) |
Students per school type | ||||
Gymnasium | 1173* (41.9%) | 525 (46.0%) | 394 (40.2%) | 254 (37.4%) |
Integrated secondary school | 1628* (58.1%) | 617 (54.0%) | 586 (59.8%) | 425 (62.6%) |
Classes per school (mean ± SD) | 3.4 ± 1.8 | 3.7 ± 1.8 | 3.6 ± 1.8 | 3.0 ± 1.9 |
Students per school (mean ± SC) | 59.6 ± 35.3* | 67.2 ± 36.2 | 61.3 ± 38.2 | 48.5 ± 30.1 |
Students per class (mean ± SD) | 17.4 ± 6.3* | 18.4 ± 5.5 | 17.2 ± 6.5 | 16.2 ± 7.1 |