Probability of at least one child in the front seat: crude and adjusted odds ratio (OR) and 95% confidence interval (95% CI)
| Crude | Adjusted | |||
|---|---|---|---|---|
| OR | 95% CI | OR | 95% CI | |
| City | ||||
| Frankfurt | 0.3 | 0.2 to 0.4 | 0.4 | 0.3 to 0.5 |
| Brussels | 0.9 | 0.7 to 1.1 | 0.5 | 0.4 to 0.6 |
| Paris | 0.3 | 0.2 to 0.4 | 0.3 | 0.3 to 0.5 |
| Boston | 1.0 | — | 1.0 | — |
| New Orleans | 1.2 | 0.9 to 1.4 | 1.1 | 0.8 to 1.4 |
| Seats per vehicle | ||||
| 2–3 | 216.0 | 30 to ∞ | 406.0 | 54 to ∞ |
| 4–6 | 1.0 | — | 1.0 | — |
| 7+ | 0.8 | 0.6 to 1.0 | 0.6 | 0.4 to 0.9 |
| Occupant mix | ||||
| 1 adult + 1 child | 1.0 | — | 1.0 | — |
| 1 adult + 2 children | 0.7 | 0.6 to 0.9 | 0.7 | 0.6 to 0.9 |
| 1 adult + 3 children | 1.8 | 1.2 to 2.7 | 2.0 | 1.3 to 3.1 |
| 1 adult + 4 or more children | 4.5 | 2.2 to 9.1 | 5.3 | 2.5 to 11.1 |
| 2 or more adults + 1or more children | 0.1 | 0.1 to 0.1 | 0.1 | 0 to 0.1 |
| Driver seat belt use | ||||
| Belted | 0.5 | 0.4 to 0.6 | 0.7 | 0.6 to 0.8 |
| Unbelted | 1.0 | — | 1 | — |
| Unknown | 0.3 | 0.2 to 0.5 | 0.5 | 0.3 to 0.8 |