Table 3. Relationship between quadriceps muscle thickness and functional performance.

Functional performance	Quadriceps muscle thickness
	β	R2	IC95%		p-value
60s-STS (no. of repetitions)	0.343	43.6%	0.022	0.665	0.037
Distance traveled (m)	-0.008	37.3%	-0.026	0.011	0.404
Handgrip strength (kg)	0.065	38.1%	-0.055	0.185	0.282

6MWT: Six-minute walk test; 60s-STS: 60s sit-to-stand test. Linear regression, p <0.05. All models were adjusted for gender, age, and height.