Characteristic | Sample size | % | Mean number of CPIs (SD) | p Value |
Total | 1265 | 100 | 0.63 (1.2) | |
Number of CPIs | ||||
0 | 859 | 68.0 | 0 | |
1 | 211 | 16.7 | 1 | |
2 | 82 | 6.5 | 2 | |
3 | 57 | 4.5 | 3 | |
4 | 24 | 1.9 | 4 | |
5 | 23 | 1.8 | 5 | |
6 | 7 | 0.6 | 6 | |
Grade | ||||
6 | 67 | 5.3 | 0.67 (1.3) | 0.35 |
7 | 164 | 13.0 | 0.48 (1.0) | |
8 | 148 | 11.7 | 0.67 (1.0) | |
9 | 245 | 19.4 | 0.60 (1.1) | |
10 | 230 | 18.2 | 0.75 (1.3) | |
11 | 219 | 17.3 | 0.69 (1.4) | |
12 | 192 | 15.2 | 0.55 (1.1) | |
School performance | ||||
Excellent | 372 | 29.4 | 0.38 (0.9) | < 0.0001 |
Good | 517 | 40.9 | 0.59 (1.2) | |
Average or below | 376 | 29.7 | 0.94 (1.4) | |
Sex | ||||
Female | 662 | 52.3 | 0.55 (1.0) | 0.007 |
Male | 603 | 47.7 | 0.73 (1.3) | |
Most kids smoke? | ||||
Disagree | 380 | 30.0 | 0.4 (0.9) | < 0.0001 |
Agree | 625 | 49.4 | 0.6 (1.1) | |
Strongly agree | 260 | 20.6 | 1.1 (1.5) | |
Environmental smoking | ||||
None | 145 | 11.5 | 0.16 (0.4) | < 0.0001 |
Family only | 104 | 8.2 | 0.37 (0.9) | |
Friends only | 343 | 27.1 | 0.29 (0.8) | |
Family and friends | 673 | 53.2 | 0.94 (1.4) |