Table 3

Injury risk by number of playgrounds

No of playgroundsOdds 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 playgrounds >3.
01.80.9 to 3.5
1–31.40.7 to 2.5
>31.0