Fig. 1.

Correlation between total muscle area and psoas muscle area at the level of the middle of the third lumbar vertebra level calculated from computed tomography findings. a There was a correlation between total muscle area and psoas muscle area at the middle level of the third lumbar vertebra (L3) level (r = 0.802, P < 0.001). b Total muscle area was manually calculated at the middle level of L3 (cm²) using personal computer software. c Psoas muscle area was manually calculated at the middle level of L3 (cm²) using personal computer software