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Table 4 Linear models using only group as covariate comparing healthy controls (H), patients with hip osteoarthritis (OA) and with total hip arthroplasty (THA)

From: Different reliability of instrumented gait analysis between patients with unilateral hip osteoarthritis, unilateral hip prosthesis and healthy controls

  ANOVA linear model Linear regression
All 3 groups H vs OA H vs THA OA vs THA
p-value Estimate* (95% C.I.) p-value Estimate* (95% C.I.) p-value Estimate* (95% C.I.) p-value
Speed m/s 0.001 −0.23 (− 0.34 to − 0.12) < 0.0005 − 0.09 (− 0.20 to 0.03) 0.15 0.14 (0.01 to 0.27) 0.035
Hip extension degree < 0.0005 13.33 (7.83 to 18.82) < 0.0005 8.86 (3.75 to 13.97) 0.001 −4.47 (−11.15 to 2.22) 0.18
Hip flexion degree 0.14 2.54 (−1.20 to 6.27) 0.18 3.98 (0.08 to 7.87) 0.046 1.44 (− 2.97 to 5.85) 0.51
Hip ext./flex range degree < 0.0005 −10.8 (− 14.28 to − 7.32) < 0.0005 −4.91 (−8.12 to − 1.69) 0.004 5.90 (2.09 to 9.70) 0.003
Hip adduction degree 0.10 2.18 (0.06 to 4.42) 0.056 1.40 (−0.36 to 3.16) 0.12 − 0.78 (− 2.85 to 1.29) 0.45
Hip abduction degree 0.12 −2.0 (−4.09 to 0.10) 0.06 −0,68 (− 2.46 to 1.11) 0.45 1.32 (− 0.65 to 3.29) 0.18
Hip add/abd range degree 0.001 −4.18 (−6.42 to − 1.94) 0.001 − 2.07 (− 4.30 to 0.17) 0.07 2.11 (0.39 to 3.84) 0.02
Hip adduction moment Nm/kg 0.07 0.05 (0.002 to 0.10) 0.04 0.04 (−0.007 to 0.09) 0.09 −0.01 (− 0.05 to 0.03) 0.59
Hip abduction moment Nm/kg 0.09 −0.15 (− 0.31 to 0.008) 0.06 − 0.05 (− 0.12 to 0.03) 0.23 0.10 (− 0.06 to 0.27) 0.21
Hip add/abd moment range Nm/kg 0.02 −0.20 (− 0.36 to − 0.05) 0.01 − 0.09 (− 0.18 to 0.009) 0.08 0.12 (− 0.04) to 0.27) 0.14
  1. P-values for the overall comparison (ANOVA), p-values and estimates for the comparison between groups are presented (Linear regression)
  2. *Beta-value