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Table 5 Linear models including group, speed, BMI and age as covariate comparing healthy controls (H), patients with hip osteoarthritis (OA) and with unilateral 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
Hip extension degree < 0.001 6.18 (0.68 to 11.68) 0.029 6.47 (0.49 to 12.45) 0.035 0.65 (−5.76 to 7.07) 0.84
Hip flexion degree 0.706 −0.95 (− 5.40 to3.50) 0.67 1.98 (− 2.91 to 6.85) 0.42 3.27 (−1.32 to 7.85) 0.16
Hip ext./flex range degree < 0.001 −7.15 (−10.48 to − 3.81) < 0.001 − 4.53 (− 7.47 to − 1.60) 0.003 2.60 (− 0.81 to 6.00) 0.13
Hip adduction degree 0.356 2.11 (− 0.83 to 5.04) 0.15 1.44 (− 0.68 to 3.55) 0.17 − 1.11 (− 3.54 to 1.32) 0.36
Hip abduction degree 0.065 − 0.38 (−2.92 to 2.17) 0.78 − 0.21 (− 2.46 to 2.03) 0.85 0.29 (− 1.76 to 2.34) 0.77
Hip add/abd range degree 0.001 −2.47 (−5.21 to 0.28) 0.076 −1.62 (− 4.16 to 0.90) 0.20 1.40 (− 0.37 to 3.18) 0.12
Hip adduction moment Nm/kg 0.170 −0.16 (− 0.03 to 0.04) 0.11 − 0.08 (− 0.009 to 0.10) 0.10 0.11 (− 0.009 to 0.07) 0.25
Hip abduction moment Nm/kg 0.003 0.03 (−0.37 to 0.04) 0.34 0.05 (−0.18 to 0.02) 0.10 0.03 (−0.08 to 0.30) 0.13
Hip add/abd moment range Nm/kg 0.041 −0.19 (− 0.40 to − 0.007) 0.058 −0.12 (− 0.24 to − 0.007) 0.039 0.08 (− 0.10 to 0.26) 0.37
  1. P-values for the overall comparison (ANOVA), p-values and estimates for the comparison between groups are presented (Linear regression)
  2. *Beta-value