Linear regression model predicting scores on the Western Ontario McMaster University Osteoarthritis Index 3 months and 1 year after surgery
| Characteristic | 3 months after surgery | 1 year after surgery | ||
|---|---|---|---|---|
| Parameter estimate (95% CI) | p value | Parameter estimate (95% CI) | p value | |
| Sex | 2.1 (0.2–3.8) | 0.031 | 0.2 (−1.3 to 1.7) | 0.81 |
| Living alone | 2.0 (0.02–4.0) | 0.042 | 3.2 (1.4 to 5.0) | < 0.001 |
| Charlson Index | 1.2 (0.4–2.0) | 0.005 | 1.8 (1.0 to 2.5) | < 0.001 |
| BMI | 0.2 (0.03–0.3) | 0.021 | 0.2 (0.1 to 0.3) | 0.002 |
| Age | 0.05 (0.001–0.2) | 0.22 | 0.1 (0.03 to 0.2) | 0.003 |
| Preoperative WOMAC | 0.3 (0.2–0.3) | < 0.001 | 0.2 (0.1 to 0.2) | < 0.001 |
| Affected joint | 5.2 (3.5–6.9) | < 0.001 | 3.2 (1.7 to 4.7) | < 0.001 |
BMI = body mass index; CI = confidence interval; WOMAC = Western Ontario McMaster University Osteoarthritis Index.