Comparison of selected characteristics of normal, slower, and slowest inactivators (n = 281)
| Normal inactivators (n = 227) | Slower inactivators (n = 36) | Slowest inactivators (n = 18) | |
|---|---|---|---|
| *Standard deviation. | |||
| †Among subjects who had ever inhaled (n = 193 normal, 27 slower, and 15 slowest inactivators, respectively). | |||
| p Values were obtained from χ2 or t test analyses (none of the associations tested were significant). | |||
| Male (%) | 39.7 | 47.2 | 33.3 |
| Age (y) at baseline, mean (SD)* | 12.8 (0.6) | 12.8 (0.4) | 12.6 (0.4) |
| Francophone (%) | 33.8 | 25.0 | 38.9 |
| Single parent family (%) | 7.1 | 8.3 | 11.1 |
| University educated (%) | |||
| Mother | 37.6 | 51.5 | 47.1 |
| Father | 42.6 | 46.9 | 35.3 |
| Household income (CAN$), mean (SD) | 61032 (21796) | 70125 (24659) | 59292 (19709) |
| Ever smoked at baseline (%) | 50.2 | 50.0 | 38.9 |
| Ever inhaled (%) | 85.0 | 75.0 | 83.3 |
| Age (y) at first inhalation, mean (SD)† | 12.9 (1.7) | 13.2 (1.6) | 13.3 (1.9) |
| Early smoking symptoms (%)† | |||
| Dizziness | 36.8 | 25.9 | 33.3 |
| Nausea | 14.5 | 7.4 | 20.0 |
| Parental smoking % | |||
| Mother | 35.0 | 22.9 | 17.7 |
| Father | 30.0 | 41.2 | 18.8 |