Fig. 2

Association between the incidence of ECMO and four indicators of critical care capacity. Association between the incidence of ECMO per 100,000 COVID-19 patients and four indicators of critical care capacity, including numbers of ICU beds, HDU beds, resource-rich ICU beds, and intensivists per 100,000 individuals. ECMO extracorporeal membrane oxygenation; COVID-19 coronavirus disease 2019; ICU intensive care unit; HDU high-dependency care unit