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Pearson correlation of male SKF and air displacement plethysmography (a). Pearson correlation P-value <0.0001. R2 values for Male CAT, 7-site, and CTS SKF are 0.83, 0.94 and 0.94 respectively. Bland-Altman graphs for CAT SKF (b), 7-site SKF (c), and CST SKF (d).