Table 1.
Characteristics of Grade 2–4 students in Hong Kong.
| Characteristics | N | % a |
|---|---|---|
| Sex | ||
| Boys | 507 | 42.6 |
| Girls | 682 | 57.4 |
| Age | ||
| ≤7 to 8 | 667 | 54.3 |
| 9 to ≥12 | 562 | 45.7 |
| Mean age (standard deviation) in years | 1229 | 8.5 (0.9) |
| Number of bedrooms at home | ||
| 1 or no | 160 | 13.2 |
| 2 | 597 | 49.3 |
| 3 or more | 453 | 37.4 |
| Perceived family affluence | ||
| Poor and poor to medium | 150 | 12.4 |
| Medium | 657 | 54.2 |
| Medium to rich and rich | 405 | 33.4 |
| Marital status of biological parents | ||
| Married | 1007 | 84.3 |
| Others | 188 | 15.7 |
| Number of co-residing smokers | ||
| None | 724 | 59.1 |
| 1 | 373 | 30.4 |
| 2 or more | 129 | 10.5 |
| Any | 502 | 41.0 |
| SHS at home | ||
| None | 912 | 76.0 |
| 1–4 days/week | 145 | 12.1 |
| 5–7 days/week | 143 | 11.9 |
| Any | 288 | 24.0 |
| SHS outside home | ||
| None | 672 | 55.5 |
| 1–4 days/week | 352 | 29.0 |
| 5–7 days/week | 188 | 15.5 |
| Any | 540 | 44.5 |
| Tobacco-related unpleasant experience in the past 30 days | ||
| No | 853 | 72.5 |
| Yes | 323 | 27.5 |
| Family unhappiness | ||
| No | 1000 | 83.5 |
| Yes | 197 | 16.5 |
Note: a Proportion of students unless otherwise stated.