Table 5.

Results of univariate and multivariate analyses

Hip abductor strength	Step 1			Step 2			Step 3
	R	p value	95%CI	B	p value	95%CI	B	p value	95%CI
Preoperative muscle strength	6.02×10-1	<.001	3.86×10-1 to 8.17×10-1	4.58×10-1	<.001*	-1.14×10-4 to -7.74×10-6
Age				-3.10×10-1	.033*	-5.90×10-1 to -3.04×10-2
Height (cm)				1.08×10-1	.672	-3.90×10-1 to 6.06×10-1
Body weight (kg)				3.29×10-1	.009*	8.71×10-2 to 5.71×10-1
Physical activity (steps)				1.50×10-3	.005*	4.79×10-4 to 2.53×10-3
Leg extension (mm)				-3.18×10-1	.017*	5.74×10-1 to 6.32×10-2
Disease duration (years)				-2.67×10-2	.004*	-3.10×10-1 to 2.56×10-1
Knee extensor strength	Step 1			Step 2			Step 3
	R	p value	95%CI	B	p value	95%CI	B	p value	95%CI
Preoperative muscle strength	-1.12×10-4	<.001	-1.14×10-4 to -7.74×10-6	-8.50×10-5	<.001*	-1.14×10-4 to -7.74×10-6	-8.97×10-5	<.001*	-1.24×10-4 to -5.44×10-6
Age				1.06×10-4	.010*	2.78×10-5 to 1.83×10-4	1.04×10-4	.009*	2.87×10-5 to 1.80×10-4
Height (cm)				-6.21×10-5	.348	-1.91×10-4 to 6.67×10-5	-3.17×10-5	.635	-1.61×10-4 to 9.86×10-5
Body weight (kg)				-5.86×10-5	.071	-1.21×10-4 to 4.49×10-6	-6.51×10-5	.043*	-1.26×10-4 to -2.78×10-6
Physical activity (steps)				-3.31×10-7	.019*	-5.97×10-7 to -5.77×10-8	-2.80×10-7	.043*	-5.44×10-7 to -1.12×10-8
Leg extension (mm)				1.43×10-5	.704	-5.78×10-5 to 8.94×10-5	1.70×10-5	.647	-5.39×10-5 to 9.06×10-5
Disease duration (years)				1.27×10-4	.004*	4.49×10-5 to 2.11×10-4	1.31×10-4	.002*	5.08×10-5 to 2.14×10-4
Age*Preoperative muscle strength							-5.90×10-6	.046*	4.49×10-5 to 2.11×10-4

Abbreviations: CI confidence interval

Step 2 yielded the final model for hip abductor strength. Step 3 yielded the final model for knee extensor strength. R = regression coefficient, B = partial regression coefficient. *: <0.05