Abt | 1193 | Multicenter cohort study (NSQIP) | 2006-2013 | Prospective | Head and neck cancer surgery | Modified frailty index | CD 4 | Good |
Adams | 6727 | Multicenter cohort study (NSQIP) | 2005-2010 | Prospective | Head and neck cancer surgery | Modified frailty index | CD 4 or 5 | Good |
Arya | 23027 | Multicenter cohort study (NSQIP) | 2005-2012 | Prospective | Vascular surgery (Open or EVAR) | Modified frailty index | CD 4 | Good |
Augustin | 13020 | Multicenter cohort study (NSQIP) | 2005-2010 | Prospective | Pancreatic resections | Modified frailty index | CD 4 | Good |
Brahmbhatt | 24645 | Multicenter cohort study (NSQIP) | 2005-2012 | Prospective | Infrainguinal vascular surgery | Modified frailty index | CD 4 | Good |
Bras | 90 | Single-center cohort study | 2008-2013 | Retrospective | Surgery for head and neck cancer | Groningen frailty indicator | CD ≥ 2 | Fair |
Chappidi | 2679 | Multicenter cohort study (NSQIP) | 2011-2013 | Prospective | Radical cystectomy | Modified frailty index | CD 4 or 5 | Good |
Chimukangara | 885 | Multicenter cohort study (NSQIP) | 2011-2013 | Prospective | Paraesofageal hernia repair | Modified frailty index | CD ≥ 3 | Fair |
Cloney | 243 | Multicenter cohort study (NSQIP) | 2000-2012 | Prospective | Glioblastoma surgery | Modified frailty index | Complications (Glioma Outcomes Project System) | Fair |
Cooper | 415 | Multicenter cohort study | 2010-2013 | Prospective | General and orthopedic surgery | Frailty phenotype; frailty index | Major complications | Fair |
Courtney-Brooks | 37 | Single-center cohort study | 2011 | Prospective | Surgery for gynecologic cancer | Fried frailty criteria | Surgical complications (NSQIP) | Fair |
Dale | 76 | Single-center cohort study | 2007-2011 | Prospective | Pancreaticoduodenectomy | 4 (of 5) components of Fried frailty criteria; VES-13 | CD ≥ 3 | Fair |
Dasgupta | 125 | Single-center cohort study | 2002-2003 | Prospective | Elective noncardiac surgery (82%) orthopedic) | Edmonton frail scale | Cardiac - / pulmonary comlications, POD | Fair |
Farhat | 35334 | Multicenter cohort study (NSQIP) | 2005-2009 | Prospective | Emergency general surgery | Modified frailty index | Any complication (not mortality) | Fair |
Flexman | 52671 | Multicenter cohort study (NSQIP) | 2006-2012 | Prospective | Spine surgery | Modified frailty index | Major complications | Good |
Hewitt | 102 | Multicenter cohort study | 2013 | Prospective | Emergency general surgery | Rockwood clinical frailty scale | Not reported | Fair |
Huisman | 328 | Multicenter cohort study | 2008-2012 | Prospective | Surgery for solid tumors | Groningen frailty indicator; VES-13 | CD ≥ 3 | Good |
Joseph | 220 | Single-center cohort study | 2012-2014 | Prospective | Emergency general surgery | Rockwood clinical frailty scale | Surgical complications (NSQIP) | Fair |
Kenig | 184 | Single-center cohort study | 2013-2014 | Prospective | Emergency abdominal surgery | VES-13, GFI; Rockwood; Balducci; TRST; Geriatric-8 | Any complication (CD) | Fair |
Kim | 197 | Single-center cohort study | 2012-2014 | Prospective | Elective noncardiac surgery | Fried frailty criteria | Surgical complications (NSQIP) | Good |
Kim | 275 | Single-center cohort study | 2011-2012 | Prospective | Elective intermediate-risk or high-risk surgery | Multidimensional frailty score | Surgical complications (NSQIP) | Good |
Krishnan | 178 | Single-center cohort study | 2011 | Prospective | Low trauma hip fracture surgery | Frailty index | Not reported | Poor |
Kristjansson | 178 | Multicenter cohort study | 2008-2011 | Prospective | Elective surgery for colorectal cancer | Comprehensive geriatric assessment | CD ≥ 2 | Good |
Kua | 82 | Single-center cohort study | 2013 | Prospective | Hip fracture surgery | Edmonton frail scale; (modified) Fried frailty criteria | Any complication | Fair |
Lascano | 41681 | Multicenter cohort study (NSQIP) | 2005-2013 | Prospective | Surgery for urologic cancer | Modified frailty index | CD 4 | Good |
Lasithiotakis | 57 | Single-center cohort study | 2008-2011 | Prospective | Elective laparoscopic cholecystectomy | Comprehensive geriatric assessment | Any complication | Poor |
Leung | 63 | Single-center cohort study | 2007 | Prospective | Noncardiac surgery | Fried frailty criteria | Not reported | Fair |
Levy | 23104 | Multicenter cohort study (NSQIP) | 2008 to 2014 | Prospective | Robot-assisted radical prostatectomy | Modified frailty index | CD 4 | Good |
Li | 189 | Single-center cohort study | Not reported | Prospective | Major intra-abdominal surgery | Fried frailty criteria | CD | Fair |
Louwers | 10300 | Multicenter cohort study (NSQIP) | 2005-2011 | Prospective | Hepatectomy | Modified frailty index | CD 4 | Good |
Makary | 594 | Single-center cohort study | 2005-2006 | Prospective | Elective surgery | Fried frailty criteria | Surgical complications (NSQIP) | Good |
McAdams-DeMarco | 537 | Single-center cohort study | 2008-2013 | Prospective | Kidney transplant surgery | Fried frailty criteria | Not reported | Fair |
McIsaac | 202811 | Single-center cohort study | 2002-2012 | Retrospective | Major elective noncardiac surgery | ACG frailty-defining diagnoses indicator | Not reported | Good |
McIsaac | 125163 | Single-center cohort study | 2003-2012 | Retrospective | Total joint arthroplasty | ACG frailty-defining diagnoses indicator | ICU-admission | Good |
Melin | 44832 | Multicenter cohort study (NSQIP) | 2005-2011 | Prospective | Carotid endarterectomy | Frailty-based bedside Risk Analysis Index | Not reported | Fair |
Mogal | 9986 | Multicenter cohort study (NSQIP) | 2005-2012 | Prospective | Pancreaticoduodenectomy | Modified frailty index | CD 3 or 4 | Good |
Mosquera | 232352 | Multicenter cohort study (NSQIP) | 2005-2012 | Prospective | elective high-risk surgery | Modified frailty index | Major and minor complications | Fair |
Neuman | 12979 | Single-center cohort study | 1992-2005 | Retrospective | Elective colorectal cancer surgery | ACG frailty-defining diagnoses indicator | Readmission within 30 days | Fair |
Obeid | 58448 | Multicenter cohort study (NSQIP) | 2005-2009 | Prospective | Laparoscopic and open colectomy | Modified frailty index | CD 4 or 5 | Fair |
Partridge | 125 | Single-center cohort study | 2011 | Prospective | Arterial vascular surgery | Edmonton frail scale | Composite postoperative complications | Fair |
Pearl | 4330 | Multicenter cohort study (NSQIP) | 2011-2014 | Prospective | Radical cystectomy | Modified frailty index | Major in-hospital complications | Good |
Phan | 3920 | Multicenter cohort study (NSQIP) | 2010-2014 | Prospective | Elective anterior lumbar interbody fusion (ALIF) surgery | Modified frailty index | Any complication | Good |
Reisinger | 159 | Single-center cohort study | 2010-2012 | Prospective | Colorectal surgery | Groningen frailty indicator | Sepsis | Good |
Revenig | 351 | Single-center cohort study | Not reported | Prospective | Major intra-abdominal surgery | Fried frailty criteria | CD 1-4 | Fair |
Revenig | 80 | Single-center cohort study | Not reported | Prospective | Intra-abdominal minimally invasive surgery | Fried frailty criteria | CD 1-4 | Fair |
Revenig | 189 | Single-center cohort study | Not reported | Prospective | Major intra-abdominal surgery | Fried frailty criteria | Any complication | Good |
Robinson | 72 | Single-center cohort study | 2007-2010 | Prospective | Colorectal surgery | Rockwood clinical frailty scale | Any postoperative complication (VASQIP) | Fair |
Shin | 6148 ACDF; 817 PCF | Multicenter cohort study (NSQIP) | 2005-2012 | Prospective | Cervical spine fusion; anterior cervical discectomy and fusion or posterior cervical fusion | Modified frailty index | CD 4 | Good |
Shin | 14583 THA; 25223 TKA | Multicenter cohort study (NSQIP) | 2005-2012 | Prospective | Total hip and knee arthroplasty | Modified frailty index | CD 4 | Good |
Suskind | 95108 | Multicenter cohort study (NSQIP) | 2007-2013 | Prospective | Common urological surgery | Modified frailty index | Major and minor complications | Good |
Suskind | 20794 | Multicenter cohort study (NSQIP) | 2011-2013 | Prospective | Inpatient urological surgery | Modified frailty index | Not reported | Good |
Tan | 83 | Multicenter cohort study | 2008-2010 | Prospective | Colorectal surgery | Fried frailty criteria | CD ≥ 2 | Fair |
Tegels | 127 | Single-center cohort study | 2005-2012 | Retrospective | Surgery for gastric cancer | Groningen frailty indicator | CD ≥ 3 | Fair |
Tsiouris | 1940 | Multicenter cohort study (NSQIP) | 2005-2010 | Prospective | Open lobectomy | Modified frailty index | CD 4 | Good |
Ugolini | 46 | Single-center cohort study | 2009-2012 | Prospective | Elective colorectal cancer surgery | Groningen frailty indicator; VES-13 | Not reported | Poor |
Uppal | 6551 | Multicenter cohort study (NSQIP) | 2008-2011 | Prospective | Surgery for gynecologic cancer | Modified frailty index | CD 4 and 5 | Good |