Abstract
Abstract The research construct of frailty in aging requires a measure with sound psychometric properties, that is stable across longitudinal points of observation. Using Exploratory Factor Analysis and Longitudinal Mixed Methods, we developed a five-factor research measures of frailty that is robust across time. Standardized regression scores for each factor allow us to estimate the change in severity of dysfunction as individuals age. We propose a system for developing research tools for the concept of frailty in large longitudinal data sets, and present our findings of five factors of frailty for females and males from the English Longitudinal Study on Ageing.
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