Development of new adjusted equations to estimate the skeletal muscle mass stratified by nutritional status for patients with rheumatoid arthritis: a methodological study

Abstract Our objective was to adjust and validate predictive equations for appendicular skeletal muscle mass (ASM) in patients with Rheumatoid Arthritis (RA). Whole-body DXA data 90 RA were used measurement of ASM (kg). The prediction equation anthropometric proposed by Lee et al generate estimates ASM. Appendicular index (ASMI, kg/m2) calculated. Frequency analysis, Paired student's t-test, Linear regression, Pearson correlation, Intraclass correlation coefficients, Bland-Altman scatter performed. statistical significance considered p<0.05. Lee’s overestimated 30% when compared ASMI DXA. When stratified nutritional status, the overweight 50% obese (p<0.05). These adjusted estimated values closer those obtained than original This greater concordance confirmed observed interclass coefficients graphs. In conclusion, may be performed that consider status patients.