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The ROC of the rGCSA, rFCSA, F/G ratio, GMFI and FMFI of each muscle. (A) rGCSA; (B) rFCSA; (C) F/G ratio; (D) GMFI; (E) FMFI. rGCSA, relative gross cross-sectional area; rFCSA, relative functional cross-sectional area; F/G ratio, the ratio of the rFCSA to the rGCSA; GMFI, gross muscle-fat index; FMFI, functional muscle-fat index; ROC, receiver operating characteristic; MF, multifidus; ES, erector spinae; PSE, paraspinal extensor muscle; PS, psoas major.
