Table 2. Separate ever smoking aggregate models.
| Predictor | Model names | ||
|---|---|---|---|
|
| |||
| Model 1 Smoking not wronga OR (95% CI) | Model 2 Smoking coola OR (95% CI) | Model 3 Friends who smokea OR (95% CI) | |
| Individual variables | |||
| RCSG | |||
| Black | 1.00 | 1.00 | 1.00 |
| Coloured | 2.46 (1.82–3.17)b | 2.59 (1.98–3.10)b | 2.08 (1.50–2.78)b |
| White | 2.42 (1.65–3.34)b | 2.30 (1.58–3.25)b | 1.85 (1.21–2.67)b |
| Smoking not wrong? | |||
| Wrong | 1.00 | – | – |
| A little wrong | 2.61 (2.29–2.90)b | – | – |
| Not wrong at all | 3.11 (2.78–3.90)b | – | – |
| Smoking cool? | |||
| No or little chance | – | 1.00 | – |
| Some chance | – | 1.76 (1.47–2.04)b | – |
| Pretty good chance | – | 1.78 (1.52–2.02)b | – |
| Friends who smoke | |||
| Zero–two | – | – | 1.00 |
| Three | – | – | 2.14 (1.70–2.59)b |
| Four | – | – | 3.11 (2.78–3.41)b |
| Repeat a grade | |||
| No | 1.00 | 1.00 | 1.00 |
| Yes | 1.22 (1.02–1.43)b | 1.19 (1.01–1.38)b | 1.18 (0.98–1.38) |
| Aggregate variables | |||
| Smoking not wrong? | |||
| Low | 1.00 | – | – |
| Medium | 1.45 (1.02–1.95)b | – | – |
| High | 1.55 (1.06–2.12)b | – | – |
| Smoking cool? | |||
| Low | – | 1.00 | – |
| Medium | – | 1.55 (1.14–2.01)b | – |
| High | – | 1.59 (1.14–2.09)b | – |
| Number of friends who smoke | |||
| Low | – | – | 1.00 |
| Medium | – | – | 1.43 (0.98–2.02) |
| High | – | – | 1.55 (1.03–2.19)b |
| Repeating a grade | |||
| Low | 1.00 | 1.00 | 1.00 |
| Medium | 1.12 (0.86–1.38) | 1.07 (0.83–1.31) | 1.00 (0.76–1.27) |
| High | 1.26 (0.98–1.51) | 1.11 (0.88–1.35) | 1.21 (0.86–1.36) |
Odds of ever smoking (yes)
Odds ratios corrected for common outcome as indicated in Zhang and Yu [26]
a
Adjusted for age, gender, racially classified social group, number of amenities, years of urban residence, repeating a grade, and individual-level variable
b
Significant odds ratio