Table 1. Characteristics of the school students in the intervention and control group at baseline (t1).
| Variable | Intervention group (n=382) | Control group (n=378) | p value | ||
| Age, mean (± SD) | 15.99 (3.17) | 15.91 (3.50) | 0.74 | ||
| Sex, % (n) | |||||
| Female | 57.3 (219) | 59.5 (225) | 0.56 | ||
| Male | 42.7 (163) | 40.5 (153) | |||
| School attended, % (n) | |||||
| Secondary general and intermediate school | 34.6 (140) | 37.6 (142) | 0.99 | ||
| Grammar school | 25.7 (95) | 24.9 (94) | |||
| Comprehensive school | 7.5 (28) | 7.1 (27) | |||
| Part-/full-time vocational school | 32.2 (119) | 30.4 (115) | |||
| Smoking status, % (n) | |||||
| Nonsmokers | 56.5 (216) | 61.9 (234) | 0.14 | ||
| Smokers | 43.5 (166) | 38.1 (144) | |||
| Smoking behavior of nonsmokers, % (n) | |||||
| Never smoked | 78.7 (170) | 82.8 (194) | 0.52 | ||
| Stopped less than 6 months beforehand | 7.9 (17) | 6.0 (14) | |||
| Stopped more than 6 months beforehand | 13.4 (29) | 11.2 (26) | |||
| Smoking behavior of smokers, % (n) | |||||
| Cigarettes | 51.0 (98) | 49.0 (94) | 0.29 | ||
| Daily | 65.3 (64) | 63.8 (60) | |||
| More than once per week | 9.2 (9) | 8.5 (8) | |||
| Once per week | 6.1 (6) | 7.5 (7) | 0.98 | ||
| Monthly | 19.4 (19) | 20.2 (19) | |||
| Water pipe | 56.3 (138) | 43.7 (107) | 0.07 | ||
| Daily | 0.0 (0) | 3.7 (4) | |||
| More than once per week | 7.3 (10) | 9.3 (10) | |||
| Once per week | 6.5 (9) | 9.3 (10) | 0.15 | ||
| Monthly | 61.6 (85) | 56.1 (60) | |||
| Yearly | 24.6 (34) | 21.5 (23) | |||
SD = standard deviation