Statistical analysis
Statistical analyses were performed using SPSS 23. Numerical variables are presented with mean±SD. Normal distribution was tested by Kolmogorov-Smirnov test if the sample size was larger than 50; otherwise the Shapiro-Wilk test was used. Mean value comparisons for numerical variables were done by Student t or Mann Whitney U tests; while categorical variables were compared by chi-square or Fisher exact tests, as appropriate. Variables which were considered to affect the presence of sarcopenia were taken into binary logistic regression analysis using the stepwise method (backward selection). The evaluation of the model adjustment and adequacy was obtained by Hosmer and Lemeshow tests.10 Statistical significance was set at p<0.05.