Linear regression model predicting preoperative scores on the Western Ontario McMaster University Osteoarthritis Index
| Characteristic | Parameter estimate (95% CI) | p value |
|---|---|---|
| Female | 5.7 (4.1–7.3) | < 0.001 |
| Living alone | 3.7 (1.8–5.6) | < 0.001 |
| Charlson Index | 1.3 (0.5–2.1) | 0.002 |
| BMI | 0.3 (0.2–0.4) | < 0.001 |
| Age | 0.2 (0.1–0.2) | < 0.001 |
BMI = body mass index; CI = confidence interval.