Table 2. Correlation between knee muscle strength and knee pain during ADL in the dominant leg.

	ADL
	Level ground walking	Stair climbing	Lying down	Standing up	Sitting on the floor with the legs folded underneath the body	Total
Extension muscle strength	−0.34**	−0.28*	−0.17	−0.13	−0.19	−0.27*
Extension strength/weight	−0.36**	−0.34**	−0.23	−0.19	−0.18	−0.31*
Flexion muscle strength	−0.22	−0.16	0.01	−0.05	−0.12	−0.14
Flexion strength/weight	−0.23	−0.15	−0.05	−0.05	−0.08	−0.14
H:Q ratio	0.04	0.11	0.09	0.05	−0.004	0.06
Q − H	−0.29*	−0.32*	−0.27*	−0.20	−0.17	−0.29*

H:Q ratio: hamstring:quadriceps ratio; Q–H: the difference between extension strength and flexion strength. *Significance of p<0.05, **Significance of p<0.01 (Pearson’s correlation coefficient)