Fig. 3

Scatter plot for correlation analysis. A Scatter plot of cross-sectional area and muscle thickness (MT) measured in (i) supine and (ii) sitting postures. B Scatter plot of muscle volume and MT measured in (i) supine and (ii) sitting postures. C Scatter plot of intramuscular adipose tissue and echo intensity measured in (i) supine and (ii) sitting postures. A p-value < 0.05 (within each scatter plot) on the Pearson correlation coefficient indicates a significant difference between parameters measured by magnetic resonance imaging and ultrasound. Each plot means older men (□), older women (◆), young men (〇), and young women (▲)