Table 4.

Multiple Regression Analysis of Determinants of Fat-Free Mass Index in COPD Patients^a

Variable	β Coefficient	95% CI	P
BMI	0.462	0.811–1.325	<0.001
Gender	0.212	1.073–2.311	<0.001
Age	−0.107	−0.509−0.085	<0.001
FEV1%	0.108	0.003–0.019	0.009
CC	0.457	0.210–0.344	<0.001

Note: ^aF = 112.686, P < 0.001, r² = 82.8%.

Abbreviations: CC, calf circumference; CI, confidence interval; FEV₁, forced expiratory value in 1 second; FFMI, fat-free mass index.