Table 5 Smoking (odds) by personal income (quartiles) within parental social class (three categories) at ages 11, 13 and 15, adjusted for sex and age (months).
| Smoking | Non‐man | III man | IV–V |
|---|---|---|---|
| Age 11 (ever) | *** | * | |
| Quart 1 | 1.00 | 1.00 | 1.00 |
| Quart 2 | 2.11* | 1.48 | 1.16 |
| Quart 3 | 2.21* | 1.97† | 1.34 |
| Quart 4 | 4.43*** | 2.76** | 1.99† |
| Age 13 | |||
| (current) | *** | ||
| Quart 1 | 1.00 | 1.00 | 1.00 |
| Quart 2 | 1.82 | 0.97 | 0.66 |
| Quart 3 | 3.75*** | 1.62 | 1.02 |
| Quart 4 | 3.88** | 1.88 | 1.62 |
| (daily) | ** | * | |
| Quart 1 | 1.00 | 1.00 | 1.00 |
| Quart 2 | 1.55 | 0.83 | 0.86 |
| Quart 3 | 6.73** | 3.28† | 1.83 |
| Quart 4 | 7.76** | 3.86* | 3.00† |
| Age 15 | |||
| (current) | ** | † | |
| Quart 1 | 1.00 | 1.00 | 1.00 |
| Quart 2 | 2.26** | 1.30 | 1.09 |
| Quart 3 | 2.57*** | 2.04* | 0.89 |
| Quart 4 | 2.76*** | 1.54 | 1.00 |
| (daily) | ** | ||
| Quart 1 | 1.00 | 1.00 | 1.00 |
| Quart 2 | 3.48*** | 1.70 | 1.22 |
| Quart 3 | 3.09** | 2.16* | 0.94 |
| Quart 4 | 3.71*** | 1.75 | 1.17 |
†p<0.10 *p<0.05 **p<0.01 ***p<0.001.