Table 2.
Patient-reported outcomes (PROs) preoperative and 1-year postoperative by education level
| Education | |||
|---|---|---|---|
| Low | Medium | High | |
| WOMAC Pain | n=340 | n=306 | n=317 |
| Preoperative | 36.0 (18.6) | 39.2 (16.0) | 43.8 (17.1) |
| 1-year postoperative | 84.3 (19.1) | 87.6 (17.3) | 89.6 (16.4) |
| Gain | 48.3 (23.3) | 48.4 (20.3) | 45.9 (19.2) |
| Effect size, Cohen’s d | 2.6 | 2.9 | 2.7 |
| WOMAC Function | n=328 | n=295 | n=306 |
| Preoperative | 36.2 (19.1) | 39.7 (17.7) | 45.5 (16.9) |
| 1-year postoperative | 76.3 (22.8) | 82.0 (19.7) | 85.6 (17.1) |
| Gain | 40.1 (24.8) | 42.2 (22.1) | 40.1 (20.0) |
| Effect size, Cohen’s d | 1.9 | 2.3 | 2.4 |
| SF-12 PCS | n=326 | n=294 | n=306 |
| Preoperative | 33.1 (7.6) | 33.9 (7.4) | 34.3 (7.9) |
| 1-year postoperative | 42.9 (9.3) | 45.6 (9.5) | 47.1 (9.5) |
| Gain | 9.8 (10.2) | 11.7 (10.0) | 12.8 (10.6) |
| Effect size, Cohen’s d | 1.2 | 1.4 | 1.5 |
| SF-12 MCS | n=326 | n=294 | n=306 |
| Preoperative | 41.9 (11.5) | 44.7 (10.6) | 47.5 (10.3) |
| 1-year postoperative | 46.4 (11.1) | 48.5 (9.8) | 49.2 (10.0) |
| Gain | 4.6 (11.4) | 3.8 (10.2) | 1.7 (10.3) |
| Effect size, Cohen’s d | 0.5 | 0.4 | 0.2 |