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