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Skeletal muscle (SM) measured by magnetic resonance imaging (MRI) versus appendicular lean soft tissue (ALST) measured by dual-energy X-ray absorptiometry (DXA) in the adult model-development group (◇, gray line; r = 0.97, P < 0.001, n = 270), in adolescents and children at Tanner stage 5(◆, dashed line; r = 0.98, P < 0.001, n = 34), and in children below Tanner stage 5 (△, black line; r = 0.99, P < 0.001, n = 65).
