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The evaluation of frailty measures requires some measurable criteria. In our environment, it is known that the use of these measures on a large scale is not easily operationalized, due to logistical difficulties. Thus, we study the possibility of identifying the syndrome of frailty through subjective questions. Objective: To validate the subjective components for evaluation of frailty. Method: This study is part of the SABE Study Health, Well-being and Ageing, held in São Paulo, Brazil. This is a cross sectional study of 433 elderly (age ≥ 75 years) in 2009. We adopted the phenotype of frailty proposed by Fried and colleagues as a gold standard (measuring objectively 5 criteria: unintentional weight loss, fatigue reported, reduced grip strength, reduced walking speed and low physical activity). In this model, elderly with one or two components were considered frail, and those with three or more were considered frail. Subjective evaluation was performed using dichotomous questions for each component. We calculated the reliability, sensitivity, specificity and positive and negative predictive values for psychometric analysis of subjective evaluation. Results: The subjective evaluation is reliable and valid. For the pre-frail elderly the sensitivity was 89.7% and specificity of 24.3%, while for the frail, the sensitivity was 63.2% and specificity of 71.6%. When analyzing frailty process (prefrail+frail) almost 90% of the frail elderly were detected in the subjective assessment, 85.2% were predicted positively and 32.7% were predicted negatively. Conclusion: The subjective evaluation of frailty is a good tool to identify frailty process in elderly.

Validação da avaliação subjetiva de fragilidade em idosos no município de São Paulo: Estudo SABE (Saúde, Bem estar e Envelhecimento)