Injury risk by number of streets with a speed limit of 30 kph
| No of streets | Odds ratio* | 95% CI |
|---|---|---|
| *Calculations with “conditional logistic regression” (SAS: PROC PHREG) with matching variable age and sex (170 cases and 168 controls). Baseline category: number of streets with speed limit at 30 kph >15. | ||
| 0–5 | 5.3 | 1.6 to 17.6 |
| 6–10 | 4.3 | 1.4 to13.4 |
| 11–15 | 2.5 | 0.8 to 8.1 |
| >15 | 1.0 | — |