Table 1

Injury risk by number of streets with a speed limit of 30 kph

No of streetsOdds 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.
0–55.31.6 to 17.6
6–104.31.4 to13.4
11–152.50.8 to 8.1