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Background: Frailty is a syndrome with important epidemiological and clinical implications in older adults. One of the most accepted definitions of frailty is that of Fried and Walston, who operationalised it according to five well defined criteria. However, their criteria are not readily applicable in primary care, where practitioners need tools to identify patients who require priority access to more specialised resources. With that objective in mind, our research group published the Frailty Instrument of the Survey of Health, Ageing and Retirement in Europe (SHARE-FI). The present paper reports the results of the Spanish sample., Methods: In the wave 1 of SHARE (2004), the Spanish sample was composed of 1,279 women and 933 men, all living in the community (mean age: 65.6 years). For each sex, a latent class analysis was used to summarise the five (adapted) frailty criteria into three incremental frailty classes. We tested the association of the frailty classes against a biopsychosocial range of wave 1 variables; the predictive validity of the frailty classes was tested using mortality data from the second wave of SHARE (2006-2007), which were available for 846 women and 660 men., Results: The frailty classes had the expected cross-sectional associations. The age-adjusted Odds ratio for mortality (with 95% confidence interval) associated with the frail class was 3.2 (1.0-10.2) for women and 8.3 (3.1-22.1) for men., Discussion: SHARE-FI is a valid and freely accessible instrument, which is intended to facilitate the adoption of the frailty paradigm in primary care., (Copyright © 2011 SEGG. Published by Elsevier Espana. All rights reserved.)