Using a Claims-Based Frailty Index to Investigate Frailty, Survival, and Healthcare Expenditures among Older Adults Hospitalized for COVID-19 at an Academic Medical Center

Economic burden of cardiorespiratory hospitalizations associated with respiratory syncytial virus among United States adults in 2017–2019

“… 28–31 Frailty status was reported as robust (CFI <0.25), prefrail or midfrailty (CFI 0.25 to <0.35), and moderate-to-severe frailty (CFI 0.25 to <0.35). 32 Code algorithms for the CCI and CFI can be found in Tables S3 and S4.…”