Table 2.
Rates of EMS utilization in the years before and after injury hospitalization (n=30,655)
| Before injury: Total uses, mean rides/person-yr (range, IQR) |
After injury: Total uses, mean rides/person-yr (range, IQR) |
Unadjusted incidence rate ratio (95% CI) |
Incidence rate ratio adjusted for risk period* (95% CI) |
Incidence rate ratio in full multivariable model** | |
|---|---|---|---|---|---|
| All EMS Uses | 16,029 0.52 (0 - 45, 0 - 1) |
27,781 0.91 (0 - 56, 0 - 1) |
1.7 (1.7 - 1.8) |
3.0 (2.9 - 3.1) |
2.4 (2.3 - 2.5) |
| Emergent EMS Uses† | 6,887 0.22 (0-24, 0-0) |
9,799 0.32 (0-21, 0-0) |
1.4 (1.4-1.5) |
2.0 (2.0 - 2.1) |
1.9 (1.8 - 2.0) |
| Non-Emergent EMS Uses† | 3,732 0.12 (0-24, 0-0) |
9,764 0.32 (0-52, 0-0) |
2.6 (2.5-2.8) |
4.6 (4.2 - 4.9) |
3.2 (3.0 – 3.5) |
*
Adjusted for time spent in an acute care hospital in the years before and after injury, and for death during the year after injury.
**
The model adjusted for risk period and included covariates of age, sex, Charlson co-morbidity score, and institutionalization status before and after injury.
†
31% of EMS uses could not be classified as emergent versus non-emergent and were not included in this part of the analysis.