• Gotaro Kojima, Steve Iliffe, and Kate Walters.
• Department of Primary Care and Population Health, University College London, Rowland Hill Street, London NW3 2PF, United Kingdom of Great Britain and Northern Ireland.
• Age Ageing. 2018 Mar 1; 47 (2): 193-200.

Backgroundtwo popular operational definitions of frailty, the frailty phenotype and Frailty index (FI), are based on different theories. Although FI was shown to be superior in predicting mortality to the frailty phenotype, no meta-analysis on mortality risk according to FI has been found in the literature.Methodsan electronic systematic literature search was conducted in August 2016 using four databases (Embase, Medline, CINAHL and PsycINFO) for prospective cohort studies published in 2000 or later, examining the mortality risk according to frailty measured by FI. A meta-analysis was performed to synthesise pooled mortality risk estimates.Resultsof 2,617 studies identified by the systematic review, 18 cohorts from 19 studies were included. Thirteen cohorts showed hazard ratios (HRs) per 0.01 increase in FI, six cohorts showed HRs per 0.1 increase in FI and two cohorts each showed odds ratios (ORs) per 0.01 and 0.1 increase in FI, respectively. All meta-analyses suggested that higher FI was significantly associated with higher mortality risk (pooled HR per 0.01 FI increase = 1.039, 95% CI = 1.033-1.044, P < 0.001; pooled HR per 0.1 FI increase = 1.282, 95% CI = 1.258-1.307, P < 0.001; pooled OR per 0.01 FI increase = 1.054, 95% CI = 1.040-1.068, P < 0.001; pooled OR per 0.1 FI increase = 1.706, 95% CI = 1.547-1.881, P < 0.001). Meta-regression analysis among 13 cohorts with HR per 0.01 increase in FI showed that the studies with shorter follow-up periods and with lower female proportion were associated with higher mortality risks by FI.Conclusionsthis systematic review and meta-analysis was the first to quantitatively demonstrate that frailty measured by the FI is a significant predictor of mortality.© The Author 2017. Published by Oxford University Press on behalf of the British Geriatrics Society.All rights reserved. For permissions, please email: journals.permissions@oup.com

26 keywords...

hide…