The 10-Item Physical Function Scale as a Sarcopenia Screening Tool for Patients on Hemodialysis

Abstract

We investigated the accuracy of the 10-item Physical Function (PF-10) questions of the SF-36 quality of life questionnaire as a sarcopenia screening tool among patients on hemodialysis. A cross-sectional, multicenter study that included adult patients on hemodialysis. The revised European Working Group on Sarcopenia in Older People was used to diagnose sarcopenia. The 10 questions about daily activities from the SF-36 quality of life questionnaire were used to appoint the PF-10, where the final score could range from 10 to 30, and the lower the worse the physical function. The PF-10 accuracy to identify confirmed sarcopenia (low muscle strength+low muscle mass) was assessed through a receiver operating characteristic curve and the cutoff was calculated using the Youden index. One hundred eighty-five patients were included (median 59years; 45% female). Prevalence of confirmed sarcopenia was 31.4%. The median PF-10 score was 23 (interquartile range: 17-27) and a significant association with all sarcopenia measurements was found (all P<.05). The best cutoff calculated from the receiver operating characteristic curve was ≤26 points (area under the curve=0.69, 95% confidence interval 0.61-0.77) with sensitivity and specificity of 96.6% and 71.0%, respectively. Moreover, patients with ≤26 points (n=133, 72%) had a higher prevalence of low muscle strength by handgrip (53 vs. 19%; P<.001) and 5-time sit-to-stand (41 vs. 10%; P<.001), low gait speed (44 vs. 19%; P=.002), confirmed sarcopenia (39 vs. 11%; P<.001), and severe sarcopenia (26 vs. 4%; P=.001), but not low muscle mass (49 vs. 35%; P=.08), in comparison with those >26 points (n=52, 28%). The PF-10 may be a useful physical dysfunction and sarcopenia screening tool in patients on hemodialysis. A PF-10 threshold of around 26 points appeared to display the fairest accuracy for diagnosing sarcopenia.