• Nienke M de Vries, J Bart Staal, Marcel G M Olde Rikkert, and Maria W G Nijhuis-van der Sanden.
• Scientific Institute for Quality of Healthcare (IQ Healthcare), Radboud University Nijmegen Medical Centre, 114 IQ Healthcare, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands. n.devries@iq.umcn.nl
• Phys Ther. 2013 Apr 1; 93 (4): 551-61.

BackgroundPhysical activity is assumed to be important in the prevention and treatment of frailty. It is unclear, however, to what extent frailty can be influenced because instruments designed to assess frailty have not been validated as evaluative outcome instruments in clinical practice.ObjectivesThe aims of this study were: (1) to develop a frailty index (i.e., the evaluative frailty index for physical activity [EFIP]) based on the method of deficit accumulation and (2) to test the clinimetric properties of the EFIP.DesignThe content of the EFIP was determined using a written Delphi procedure. Intrarater reliability, interrater reliability, and construct validity were determined in an observational study (n=24).MethodIntrarater reliability and interrater reliability were calculated using Cohen kappa and intraclass correlation coefficients (ICCs). Construct validity was determined by correlating the score on the EFIP with those on the timed "up & go" test (TUG), the performance-oriented mobility assessment (POMA), and the Cumulative Illness Rating Scale for Geriatrics (CIRS-G).ResultsFifty items were included in the EFIP. Interrater reliability (Cohen kappa=0.72, ICC=.96) and intrarater reliability (Cohen kappa=0.77 and 0.80, ICC=.93 and .98) were good. As expected, a fair to moderate correlation with the TUG, POMA, and CIRS-G was found (.61, -.70, and .66, respectively).LimitationsReliability and validity of the EFIP have been tested in a small sample. These and other clinimetric properties, such as responsiveness, will be assessed or reassessed in a larger study population.ConclusionThe EFIP is a reliable and valid instrument to evaluate the effect of physical activity on frailty in research and in clinical practice.

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