Baseline characteristics of the overall COMPASS sample (2013/14) and respondents followed longitudinally to 2014/15, Ontario and Alberta, Canada
| Characteristic (at baseline) | Sample; no. (%) of participants | p value† | |
|---|---|---|---|
| Overall sample n = 44 163 | Longitudinal sample* n = 19 310 | ||
| Age, yr | < 0.001 | ||
| ≤ 14 | 9743 (22.1) | 6255 (32.4) | |
| 15 | 11 283 (25.6) | 6517 (33.7) | |
| 16 | 11 175 (25.3) | 5238 (27.1) | |
| 17 | 9122 (20.7) | 1198 (6.2) | |
| ≥ 18 | 2840 (6.4) | 102 (0.5) | |
| Sex | < 0.001 | ||
| Female | 21 901 (49.6) | 10 303 (53.4) | |
| Male | 22 262 (50.4) | 9007 (46.6) | |
| Race/ethnicity‡ | < 0.001 | ||
| White | 32 886 (74.8) | 14 940 (77.7) | |
| Black | 1689 (3.8) | 603 (3.1) | |
| Asian | 2241 (5.1) | 979 (5.1) | |
| Aboriginal | 1546 (3.5) | 478 (2.5) | |
| Latin American/Hispanic | 830 (1.9) | 305 (1.6) | |
| Other/mixed | 4759 (10.8) | 1929 (10.0) | |
| Spending money, $ | < 0.001 | ||
| 0 | 7046 (16.0) | 3605 (18.7) | |
| 1–20 | 12 680 (28.7) | 6594 (34.1) | |
| 21–100 | 11 749 (26.6) | 4650 (24.1) | |
| > 100 | 6994 (15.8) | 1850 (9.6) | |
| Don’t know/not stated | 5694 (12.9) | 2611 (13.5) | |
| Smoking status | < 0.001 | ||
| Never tried, not susceptible | 22 187 (50.2) | 11 075 (57.4) | |
| Never tried, susceptible | 9537 (21.6) | 4719 (24.4) | |
| Puffer | 4465 (10.1) | 1524 (7.9) | |
| Experimental smoker | 4819 (10.9) | 1447 (7.5) | |
| Former smoker | 372 (0.8) | 90 (0.5) | |
| Current occasional smoker | 1409 (3.2) | 263 (1.4) | |
| Current daily smoker | 1374 (3.1) | 192 (1.0) | |
↵* A total of 19 310 student surveys from the baseline wave (2013/14) were linked to surveys in the follow-up wave (2014/15).
↵† From χ2 test of difference in baseline characteristics between overall sample and those retained at follow-up.
↵‡ Totals of 212 and 76 in the baseline and longitudinal samples, respectively, were missing information on race/ethnicity.