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| Number | Percentage (%) | |
|---|---|---|
| Sex (n = 40) | ||
| Male | 26 | 65 |
| Female | 14 | 35 |
| Age (n = 40) | ||
| 11 years | 7 | 17.5 |
| 12 years | 33 | 82.5 |
| BMI (n = 40) | ||
| < 18.5 | 10 | 25.0 |
| 18.5–22.9 | 21 | 52.5 |
| 23.0–24.9 | 7 | 17.5 |
| > 25 | 2 | 5.0 |
| Parental smoking (n = 40) | ||
| Smoking | 18 | 45.0 |
| Non-smoking | 22 | 55.0 |
| Parental income (n = 40) | ||
| High | 12 | 30.0 |
| Middle | 21 | 52.5 |
| Low | 9 | 22.5 |
