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Table 6 Stepwise regression analysis estimating multivariate association between preoperative physical outcome measures and physical activity level (independent variables) and physical activity level one year after surgery (dependent variable) (n = 108)

From: Effects of pre-surgery physiotherapy on walking ability and lower extremity strength in patients with degenerative lumbar spine disorder: Secondary outcomes of the PREPARE randomised controlled trial

  Step 1   Step 2  
Independent variable Unstandardized Beta (SE) P-value Unstandardized Beta (SE) P-value
Gait speed, normal 0.430 (0.57) 0.449 0.502 (0.53) 0.348
Gait speed, fast 0.203 (0.39) 0.604 −0.159 (0.38) 0.677
Quadriceps strength, right 0.021 (0.02) 0.325 0.020 (0.02) 0.330
Quadriceps strength, left −0.011 (0.01) 0.550 −0.010 (0.01) 0.547
ODI item four −0.123 (0.12) 0.309 −0.062 (0.11) 0.586
Self-rated walking distance 0.079 (0.13) 0.548 0.084 (0.12) 0.499
Physical activity level    0.281 (0.07) < 0.001
  R Square = 0.174 0.003 R Square = 0.275 < 0.001
  1. SE Standard Error, ODI Oswestry Disability Index. Bold text p < .05