Table 3.
Logistic regression models identifying predictors of non-satisfaction 12-month after primary total knee replacement.
| Intercept and Predictors (reference category) | COASt (sample = 450) | GAR (sample = 791) | ||
|---|---|---|---|---|
| Coefficient (95% CI) |
P value | Re-estimated coefficient (95% CI) |
P value | |
| Intercept | −3.29 | −0.68 | ||
| Sex (Women) | ||||
| Men | −0.19 (−0.82 to 0.44) |
0.55 | −0.22 (−0.63 to 0.18) |
0.28 |
| Age at operation, years | 0.02 (−0.01 to 0.06) |
0.23 | −0.03 (−0.05 to −0.01) |
0.003 |
| Prior treatment for anxiety (No) | ||||
| Yes | 0.997 (0.21 to 1.78) |
0.01 | 0.05 (−0.53 to 0.63) |
0.86 |
| Current smoker (No) | ||||
| Yes | 0.93 (−0.26 to 2.12) |
0.12 | 0.41 (−0.12 to 0.94) |
0.13 |
| Injection of corticosteroids (No) | ||||
| Yes | −1.04 (−1.87 to −0.21) |
0.01 | −0.22 (−0.78 to 0.34) |
0.45 |
| Standardised OKS/WOMAC, points | −0.37 (−0.67 to −0.07) |
0.02 | −0.31 (−0.53 to −0.09) |
0.006 |
| AUC | 0.69 | 0.64 | ||
| Optimism | 0.04 | — | ||
| Bias-corrected AUC | 0.65 | — | ||
Clinical outcomes in arthroplasty study, COASt; Geneva arthroplasty registry, GAR; 95% confidence intervals, CI; Oxford knee score, OKS; Western Ontario & McMaster Universities Osteoarthritis Index, WOMAC; Area Under the receiver operating characteristic Curve, AUC.