Table 3. Multiple regression analysis of factors related to knee extension muscle strength.

Each multivariate analysis was conducted by using age and sex plus one factor as confounding factors to avoid overfitting due to the small sample size.

ECW/TBW: Extracellular water/total body water, TUG: Timed up & go test, Alb: Albumin

Confounding factor	Coefficient of determination (R2)	Standardized coefficient (β)	p-value	95% confidence interval
Knee extension on muscle strength adjusted by age, sex, and ECW/TBW	0.393	-0.337	0.044	-19.604 to -0.297
Knee extension on muscle strength adjusted by age, sex, and TUG	0.548	-0.576	0.006	- 0.242 to -0.046
Knee extension on muscle strength adjusted by age, sex, and Alb	0.339	0.235	0.152	- 0.074 to 0.449