Table 3 Results of the regression of functional ability (walking time, GUG time and WOMAC-PF) on mid-stance VVP* and total muscle strength
Variables‡Walking timeGUGWOMAC-PF
b† (SE)p Valueb (SE)p Valueb (SE)p Value
Intercept86.9311.3330.90
Mid-stance VVP7.40 (2.16)0.0011.03 (0.470.0312.29 (1.01)0.028
Muscle strength−52.17 (7.48)0.000−10.00 (1.61)0.000−15.83 (3.51)0.000
Mid-stance VVP× muscle strength−5.74 (4.52)0.210−0.36 (0.97)0.716−0.1.30 (2.12)0.543
Mid-stance VVP diff§3.96 (1.53)0.0120.87 (0.33)0.011−1.46 (0.72)0.851
R2 = 0.54 F = 16.66 <0.001R2 = 0.45 F = 11.57 <0.001R2 = 0.36 F = 8.03 <0.001
  • *Mid-stance VVP as the varus–valgus angle of the OA knee in mid-stance of the gait cycle.

  • †b = unstandardised regression coefficient.

  • ‡Variables centred around the mean.

  • §Mid-stance VVP diff = the difference between left and right mid-stance VVP data.

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