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. Author manuscript; available in PMC: 2018 Dec 14.
Published in final edited form as: Eur Respir J. 2017 Dec 14;50(6):1701134. doi: 10.1183/13993003.01134-2017

Table 2.

Manual stepwise model building in the training group of ECLIPSE COPD cases to generate formula to convert PMA to FFM.

Independent Variable Adjusted R2 Beta P-value
Model 1 0.38
PMA (cm2) 0.79 <0.0001
Model 2 0.79
PMA (cm2) 0.4 <0.0001
Weight (kg) 0.41 <0.0001
Model 3 0.90
PMA (cm2) 0.08 <0.0001
Weight (kg) 0.38 <0.0001
Sex (ref: male) 9.5 <0.0001
Model 4 0.92
PMA (cm2) 0.09 <0.0001
Weight (kg) 0.35 <0.0001
Sex (ref: male) 7.5 <0.0001
Height (cm) 0.20 <0.0001

Abbreviation: PMA – pectoralis muscle area, FFM – fat-free mass.