Concordances and differences between a unidimensional and multidimensional assessment of frailty: a cross-sectional study

Background Many instruments to identify frail older people have been developed. One of the consequences is that the prevalence rates of frailty vary widely dependent on the instrument selected. The aims of this study were 1) to examine the concordances and differences between a unidimensional and multidimensional assessment of frailty, 2) to assess to what extent the characteristics of a ‘frail sample’ differ depending on the selected frailty measurement because ‘being frail’ is used in many studies as an inclusion criterion.