Description of the individual’s study sample stratified by city
| Total | Malang | Pekanbaru | Pontianak | Gorontalo | Denpasar | Samarinda | Cimahi | |
| Total number of schools | 22 | 4 | 3 | 3 | 4 | 2 | 3 | 3 |
| Total number of individuals | 2820 | 479 | 467 | 463 | 437 | 240 | 467 | 267 |
| Individual characteristics | ||||||||
| Age (in years) | ||||||||
| 13–14 | 34.4 | 35.7 | 34.5 | 36.9 | 36.6 | 0* | 47.8 | 31.8 |
| 15–16 | 37.6 | 44.0 | 15.4 | 42.1 | 50.8 | 44.6 | 29.9 | 41.9 |
| 17–18 | 28.0 | 20.3 | 50.1 | 21.0 | 12.6 | 55.4 | 22.3 | 26.3 |
| Gender | ||||||||
| Female | 58.5 | 58.5 | 64.5 | 49.7 | 41.2 | 57.5 | 46.7 | 43.8 |
| Male | 41.5 | 41.5 | 35.5 | 50.3 | 58.8 | 42.5 | 53.3 | 56.2 |
| Smoking status | ||||||||
| Non-smokers | 84.3 | 84.3 | 95.5 | 81.2 | 68.4 | 85.0 | 76.4 | 79.0 |
| Smokers | 15.7 | 15.7 | 4.5 | 18.8 | 31.6 | 15.0 | 23.6 | 21.0 |
*Students of seventh and eighth grades (13–14 years) in Denpasar, Bali, were not present during survey because of the examination days of ninth grade.