Table 2 Results of the regression of functional ability (walking time, GUG time and WOMAC-PF) on VV-ROM* and total muscle strength
Walking timeGUG timeWOMAC-PF
Variables‡b† (SE)p Valueb (SE)p Valueb (SE)p Value
Intercept96.6113.4629.62
VV-ROM (degrees)3.96 (2.28)0.0880.25 (0.49)0.6121.91 (1.04)0.071
Muscle strength (Nm/kg)−53.94 (7.63)0.000−9.97 (1.64)0.000−17.24 (3.47)0.000
VV-ROM×muscle strength−14.21 (5.94)0.020−2.39 (1.28)0.067−2.89 (2.70)0.289
R2 = 0.50 F = 19.09 <0.001R2 = 0.40 F = 12.85 <0.001R2 = 0.35 F = 10.18 <0.001
  • *VV-ROM as the varus–valgus range of motion of the knee with osteoarthritis in the loading response phase of the gait cycle.

  • †b = unstandardised regression coefficient.

  • ‡Variables centred around the mean.

  • SE, standard error; GUG, Get Up and Go test; PF, physical function.