title: Use of the Modified Frailty Index in the American College of Surgeons National Surgical Improvement Program Database: Highlighting the Problem of Missing Data.
authors: Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland.
authors: Faiz
authors: F
authors: Gani
authors: Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland.
authors: Joseph K
authors: JK
authors: Canner
authors: Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland2Department of Surgery, The Ohio State University Wexner Medical Center, Columbus3Deputy Editor, JAMA Surgery.
authors: Timothy M
authors: TM
authors: Pawlik
mesh_terms: D000368:Aged; D016208:Databases, Factual; D000073496:Frailty / Q000145:classification*; D006801:Humans; D015397:Program Evaluation; D058996:Quality Improvement; D013514:Surgical Procedures, Operative / Q000592:standards* / Q000706:statistics & numerical data; D014481:United States