Fig. 3

(a-d) Segmentation and measurement of skeletal muscle area at the L3 level based on radiodensity. Muscles highlighted in red comprise the psoas, paraspinal muscles (including erector spinae, multifidus, and quadratus lumborum), and abdominal wall muscles (transversus abdominis, external and internal obliques, and rectus abdominis); (e) Comparisons of body composition and serum CK levels between male and female patients; (f) Correlations between serum CK levels and body composition, albumin concentration, PNI, and BMI. CK, creatine kinase; BMI, body mass index; SMA, skeletal muscle area; SAT, subcutaneous adipose tissue; VAT, visceral adipose tissue; ALB, albumin; PNI, prognostic nutritional index