Table 3:
Incidence of pedestrian-related injury by participating school before and after the intervention.
| School | Pre | Post | Model | |||||
|---|---|---|---|---|---|---|---|---|
| Injuries | Total person-time at risk, y a | IR b | Injuries | Total person-time at risk, y a | IR b | Rate ratioc (95% CI) | Standardized rate ratiod (95% CI) | |
| 1 | 1 | 10787 | 0.93 | 0 | 10930 | 0 | ||
| 2 | 3 | 1309 | 22.92 | 1 | 1277 | 7.83 | ||
| 3 | 0 | 10787 | 0 | 0 | 10930 | 0 | ||
| 4 | 0 | 3581 | 0 | 0 | 3498 | 0 | ||
| 5 | 0 | 2476 | 0 | 0 | 2635 | 0 | ||
| 6 | 1 | 4019 | 2.49 | 0 | 4019 | 0 | ||
| 7 | 1 | 3833 | 2.61 | 0 | 3796 | 0 | ||
| 8 | 0 | 5629 | 0 | 0 | 5600 | 0 | ||
| 9 | 0 | 2860 | 0 | 0 | 2880 | 0 | ||
| 10 | 0 | 4041 | 0 | 1 | 4016 | 2.49 | ||
| Total | 6 | 49322 | 1.22 | 2 | 49581 | 0.40 | 0.33 (0.19, 0.58)* | 0.28 (0.11, 0.73)* |
a
Total number of elementary-age children within the zip coverage of each school during the 1-year pre/post pedestrian safety education.
b
Incidence rate per 10,000 children/year
c
Rate ratio (post-vs. pre-) from negative binomial model using person-time denominators in each exposure period.
d
Standardized rate ratio (post-vs. pre-) from negative binomial regression. Expected number of events calculated using Los Angeles city census data as the standard population.
*
p<0.01