20 Incidence & Demographics 2018 Dataset and Incidence of OHCA Events This report describes CARES data from the most recent calendar year, January 1 to December 31, 2018. CARES requires that an EMS Agency enter at least one complete calendar year of data and meet a patient lost to follow-up threshold of less than 1% to be included in the Annual National Report. The CARES 2018 National Reports can be viewed at: https://mycares.net/sitepages/reports2018.jsp. Descriptive statistics in this report are presented as frequencies or proportions for categorical variables, and median and interquartile ranges for continuous variables. Comparison of proportions were conducted using the chi-square test. The 2018 dataset includes 1,239 EMS Agencies and 1,412 Hospitals, and represents a population of 110.1 million, approximately 34% of the U.S. population. In 2018, 81,864 OHCA events were reported to CARES. The crude incidence of non-traumatic, worked arrests was 74.3 per 100,000, consistent with the incidence rate observed in 2017. Using 2018 census data to extrapolate to the U.S. population 4 , CARES estimates that there were approximately 243,000 EMS-treated, non-traumatic OHCAs in the United States last year. Demographics In 2018, CARES patients were predominately male (62.1%). Of the reported OHCA events, 97.1% (n=79,490) were adults and 2.9% (n=2,340) were children, 18 years and younger. The median age of OHCA patients was 64.0 years (mean: 62.2; SD: 19.3). The age distribution varied significantly across the sexes (Figure 2), with females having a higher median age of arrest (66.0 vs. 63.0 years, p