Table 5. Coefficients for each predictor for QMVC obtained from multiple regression analysis.

	Unstandardized	Standardized		P value
	B	Beta	Error
Constant	−1.928		4.049	0.636
MNI (score)	−0.472	−0.279	0.144	0.002
male/female	6.589	0.450	0.992	<0.001
FEV1pred (%)	0.137	0.325	0.032	<0.001
PA (score)	0.747	0.224	0.270	0.007

FEV1: forced expiratory volume for 1 second; MNI: multiparameter nutritional index; PA: physical activity; QMVC: quadriceps maximal volitional contraction.