Table 5. Forward stepwise multiple regression models identifying the relationships between 4MGS and 6MWD and other outcome measures in the study cohort.

	4MGS			6MWD
	r	P value		r	P value
Age, years	−0.207	0.145		−0.3111	0.0263
%DLCO, %				0.5137	0.0001
mMRC score	−0.3686	0.0078		−0.4421	0.0012
QF torque, Nm/kg	0.1979	0.1639

4MGS, 4-m gait speed; 6MWD, 6-min walk distance; DLCO, diffusing capacity of carbon monoxide; mMRC, modified Medical Research Council; QF, quadriceps force.