| Comparison | Intervention | ||||
---|---|---|---|---|---|---|
 | All (n = 241) M ± SD or % | Boys (n = 114) M ± SD or % | Girls (n = 127) M ± SD or % | All (n = 720) M ± SD or % | Boys (n = 363) M ± SD or % | Girls (n = 357) M ± SD or % |
Demographics | Â | Â | Â | Â | Â | Â |
 Age (years) | 9.6 ± 0.3 | 9.6 ± 0.3 | 9.6 ± 0.3 | 9.6 ± 0.3 | 9.6 ± 0.3 | 9.6 ± 0.3 |
 Ethnicity (White British) | 98.3 | 99.1 | 97.6 | 82.1 | 82.6 | 81.5 |
 Deprivation level (IMD) | 50.9 ± 17.9 | 49.8 ± 17.7 | 51.9 ± 18.2 | 55.7 ± 16.4 | 55.5 ± 16.5 | 55.8 ± 16.3 |
Enjoyment of physical activity | Â | Â | Â | Â | Â | Â |
 PACES enjoyment scale (range 1–5) | 4.3 ± 0.7 | 4.3 ± 0.7 | 4.3 ± 0.7 | 4.3 ± 0.7 | 4.2 ± 0.8 | 4.4 ± 0.6 |
Smoking intentions | Â | Â | Â | Â | Â | Â |
 Total non-smoking intentions (range 4–12) | 11.7 ± 1.0 | 11.6 ± 1.1 | 11.7 ± 0.9 | 11.8 ± 0.8 | 11.7 ± 1.0 | 11.9 ± 0.5 |
Self-efficacy | Â | Â | Â | Â | Â | Â |
 Total refusal self-efficacy (range 3–15) | 13.5 ± 3.2 | 13.5 ± 3.1 | 13.5 ± 3.3 | 13.7 ± 3.0 | 13.4 ± 3.3 | 14.0 ± 2.7 |
Attitudes towards smoking | Â | Â | Â | Â | Â | Â |
 Smoking is bad for health (‘definitely yes’) | 88.8 | 87.7 | 89.8 | 90.1 | 86.2 | 94.1 |
 Safe to smoke year or two (‘definitely not’) | 59.8 | 60.5 | 59.1 | 64.4 | 63.6 | 65.3 |
 Difficult to quit once started (‘definitely yes’) | 43.2 | 45.6 | 40.9 | 52.8 | 51.2 | 54.3 |
 Others smoke harmful to you (‘definitely yes’) | 59.3 | 60.5 | 58.3 | 66.1 | 63.1 | 69.2 |
 Affects sports performance (‘definitely yes’) | 51.0 | 53.5 | 48.8 | 58.3 | 59.2 | 57.4 |
 Makes you gain/lose weight (‘no difference’) | 42.3 | 37.7 | 46.5 | 42.6 | 45.2 | 40.1 |
Social influences | Â | Â | Â | Â | Â | Â |
 Mother smoking | 40.7 | 39.5 | 41.7 | 34.9 | 32.2 | 37.5 |
 Father smoking | 43.6 | 47.4 | 40.2 | 38.2 | 38.0 | 38.4 |
 Sibling smoking | 10.8 | 10.5 | 11.0 | 9.2 | 8.0 | 10.4 |
 Friend smokinga | 18.7 | 25.4 | 12.6 | 17.1 | 22.9 | 11.2 |