Prevalence of smoking intention by covariate in primary and secondary never-smoking students
| Primary students (n=15 753) | Secondary students (n=38 398) | |||||||||
| All | Intention to smoke | All | Intention to smoke | |||||||
| n | (%)* | n | (%)† | p Value‡ | n | (%)* | n | (%)† | p Value‡ | |
| Mean age, years (SD) | 10.0 | (0.9) | 10.2 | (0.9) | <0.001 | 14.5 | (1.9) | 14.4 | (1.9) | 0.07 |
| Sex | ||||||||||
| Boys | 8082 | (51.4) | 414 | (5.1) | 0.15 | 19 378 | (50.5) | 2587 | (13.4) | <0.001 |
| Girls | 7656 | (48.7) | 330 | (4.3) | 19 010 | (49.5) | 1954 | (10.3) | ||
| Perceived family affluence | ||||||||||
| Rich | 3016 | (19.3) | 111 | (3.7) | 0.003 | 5928 | (15.5) | 685 | (11.5) | 0.019 |
| Average | 9988 | (64.0) | 433 | (4.3) | 21 729 | (56.7) | 2449 | (11.3) | ||
| Poor | 2613 | (16.7) | 180 | (6.9) | 10 644 | (27.8) | 1386 | (13.0) | ||
| Family structure | ||||||||||
| Intact | 13 009 | (82.7) | 613 | (4.7) | 0.52 | 30 820 | (80.2) | 3502 | (11.4) | <0.001 |
| Single-parent | 1905 | (12.1) | 84 | (4.4) | 5450 | (14.2) | 703 | (12.9) | ||
| No-parent | 823 | (5.2) | 47 | (5.8) | 2118 | (5.5) | 336 | (15.9) | ||
| Parental smoking | ||||||||||
| None | 10 323 | (65.7) | 443 | (4.3) | 0.03 | 27 391 | (71.5) | 3014 | (11.0) | <0.001 |
| Either | 4579 | (29.2) | 235 | (5.1) | 9706 | (25.3) | 1308 | (13.5) | ||
| Both | 803 | (5.1) | 67 | (8.3) | 1224 | (3.2) | 198 | (16.2) | ||
| Sibling smoking | ||||||||||
| No | 15 466 | (98.5) | 726 | (4.7) | 0.09 | 37 095 | (96.8) | 4289 | (11.6) | <0.001 |
| Yes | 240 | (1.5) | 18 | (7.6) | 1226 | (3.2) | 231 | (18.9) | ||
Data were weighted by age, sex and grade; may not add up to 100% due to rounding.
*Column percentages.
†Row percentages.
‡Calculated by t-test for continuous variables and χ2 test for categorical variables.