Fig. 1

Association of skeletal muscle index (SMI) with age, body mass index (BMI, diffusion capacity of lung for carbon monoxide, and forced expiratory volume at 1 s. SMI was quantified at L4 vertebral level using computerized tomography scans of 492 NSCLC patients. The scatter plots illustrate the correlation between patients’ age, BMI, DLCO, and FEV₁ and SMI. Pearson correlation coefficients (r) are shown