Control and intervention group differences in smoking uptake rates
| Subgroup | % starting to smoke | Odds ratio (95% CI) | p Value | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Control group | Intervention group | |||||||||
| n | N | % | n | N | % | |||||
| All | 89 | 1144 | 7.8 | 54 | 1068 | 5.1 | 1.6 (1.1 to 2.2) | 0.006 | ||
| Boys | 28 | 535 | 5.2 | 12 | 510 | 2.4 | 2.3 (1.2 to 4.6) | 0.011 | ||
| Girls | 61 | 609 | 10.0 | 42 | 558 | 7.5 | 1.4 (0.9 to 2.1) | 0.08 | ||
| Boys 10–11 | 3 | 206 | 1.5 | 1 | 168 | 0.6 | 2.5 (0.3 to 23.9) | 0.39 | ||
| Boys 12–13 | 6 | 180 | 3.3 | 3 | 193 | 1.6 | 2.2 (0.5 to 8.9) | 0.22 | ||
| Boys 14–15 | 19 | 149 | 12.8 | 8 | 149 | 5.4 | 2.6 (1.1 to 6.1) | 0.021 | ||
| Girls 10–11 | 11 | 248 | 4.4 | 3 | 222 | 1.4 | 3.4 (1.0 to 12.3) | 0.043 | ||
| Girls 12–13 | 26 | 202 | 12.9 | 20 | 187 | 10.7 | 1.2 (0.7 to 2.3) | 0.31 | ||
| Girls 14–15 | 24 | 159 | 15.1 | 19 | 149 | 12.8 | 1.2 (0.6 to 2.3) | 0.33 | ||
| Potential smokers | ||||||||||
| All | 39 | 218 | 17.9 | 29 | 200 | 14.5 | 1.3 (0.8 to 2.2) | 0.21 | ||
| Boys | 13 | 101 | 12.9 | 5 | 91 | 5.5 | 2.5 (0.9 to 6.3) | 0.06 | ||
| Girls | 26 | 117 | 22.2 | 24 | 109 | 22.0 | 1.0 (0.5 to 1.9) | 0.55 | ||
| Definite non-smokers | ||||||||||
| All | 50 | 926 | 5.4 | 25 | 868 | 2.9 | 1.9 (1.2 to 3.1) | 0.005 | ||
| Boys | 15 | 434 | 3.5 | 7 | 419 | 1.7 | 2.1 (0.9 to 5.2) | 0.076 | ||
| Girls | 35 | 492 | 7.1 | 18 | 449 | 4.0 | 1.8 (1.0 to 3.3) | 0.027 | ||
p Values shown are results from Fisher's exact test (one tailed).
Potential smokers and definite non-smokers were categorised on the basis of smoking attitude recorded in the initial questionnaire.