Heart attack patients who received aspirin within 24 hours before or after hospital arrival
Heart attack patients > 17 years of age without aspirin contraindications
Hospital Compare sample rates were downloaded from the CMS web site: http://www.medicare.gov/Download/DownloadDB.asp
Hospital population weights were computed based on estimates imputed from the denominators for Hospital Compare readmissions. Hospital referral region (HRR) rates were computed as the weighted average of the hospital sample rates within the HRR using the population weights.
State rates were computed as weighted averages of the hospital sample rates within the state.