Association between peripheral muscle strength, exercise performance, and physical activity in daily life in patients with Chronic Obstructive Pulmonary Disease

Table 3 Multiple regression analysis of predictors of the 6MWD (m)

Model 1	Coefficient B	Std. Error	Coefficient β	t	p
Residual	434.893	162.825		2.67	0.014
Quadriceps muscle strength (Nm)	10.02	3.96	0.42	2.53	0.019
FEV₁ (% predicted)	2.29	1.04	0.371	2.20	0.038
Age (years)	-4.30	2.56	-0.28	-1.68	0.107

6MWD, 6-minute walk distance; FEV₁, forced expiratory volume in one second (r2 = 0.524).