Table 3.
EMS Utilization for Suspected Stroke in Specific Regions of Chicago Before and After Intervention
| Preintervention, Suspected Stroke/Total EMS Calls, n (%) | Postintervention, Suspected Stroke/Total EMS Calls, n (%) | OR (95% CI) | P Value | |
|---|---|---|---|---|
| Area centered around included intervention hospital (3.5‐mile circular radius) |
440/48 150 (0.91) |
603/47 714 (1.26) |
1.4 (1.2–1.6) | <0.001 |
| Area centered around excluded intervention hospital (3.5‐mile circular radius) |
684/69 949 (0.98) |
846/69 547 (1.22) |
1.2 (1.1–1.4) | <0.001 |
| South Side (south of interstate 290) | 2342/260 388 (0.90) | 2897/267 479 (1.08) | 1.2 (1.1–1.3) | <0.001 |
| North Side (north of interstate 290) |
1904/158 408 (1.20) |
1978/162 947 (1.21) | 1.0 (0.9–1.1) | 0.757 |
EMS indicates emergency medical services; and OR, odds ratio.