Table 1.
Variable | Medicarea | CARES | ROC | OPALS Study |
---|---|---|---|---|
No. of patients who arrived at the hospital via EMS | 32 935 | 24 843 | 7486 | 4247 |
Inpatients who died before discharge, % | 66 | 63 | NA | NA |
Inpatients and outpatients who died before discharge, % | 90 | 88 | 87 | 95 |
Abbreviations: CARES, Cardiac Arrest Registry to Enhance Survival29; EMS, emergency medical services; NA, not available; OPALS, Ontario Prehospital Advanced Life Support10; ROC, Resuscitation Outcomes Consortium.30
Discharge status for Medicare outpatient claims was approximated using 2-day mortality because discharge status was poorly coded.