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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
  1. SD: standard deviation, *Based on the number of students completing the baseline questionnaire.