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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: JAMA Intern Med. 2015 Feb 1;175(2):196–204. doi: 10.1001/jamainternmed.2014.5420

Table 1.

Comparison of Medicare Claims–Based Sample and Primary Data–Based Samples on Mortality at Discharge for Individuals Brought to a Hospital

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

a

Discharge status for Medicare outpatient claims was approximated using 2-day mortality because discharge status was poorly coded.