Patient-reported outcome comparisons by BMI group.
| Outcome | Mean ± SD (n) | R 2 | P Valuea | |||
| Nonobese (N = 74) | Obese I (N = 27) | Obese II (N = 19) | Obese III (N = 8) | |||
| PROMIS-PF | ||||||
| Preoperative | 40.7 ± 6.6 (74) | 38.6 ± 8.8 (27) | 38.6 ± 5.7 (19) | 39.4 ± 7.8 (8) | 0.021 | 0.458 |
| 6 wk | 42.5 ± 6.6 (53) | 39.6 ± 7.9 (17) | 39.2 ± 7.4 (15) | 39.3 ± 6.7 (7) | 0.048 | 0.220 |
| 12 wk | 45.3 ± 8.7 (47) | 49.7 ± 13.0 (15) | 40.8 ± 5.5 (13) | 43.9 ± 13.5 (4) | 0.077 | 0.109 |
| 6 mo | 47.9 ± 9.1 (41) | 51.7 ± 11.3 (11) | 41.1 ± 6.7 (11) | 44.5 ± 7.3 (3) | 0.114 | 0.060 |
| 1 y | 50.5 ± 7.8 (35) | 50.8 ± 9.5 (10) | 43.0 ± 6.5 (8) | 42.2 ± 6.9 (4) | 0.149 | 0.035 |
| 2 y | 51.3 ± 7.9 (25) | 45.5 ± 9.1 (10) | 41.7 ± 5.0 (9) | 42.5 ± 13.1 (6) | 0.205 | 0.014 |
| PROMIS-PF | ||||||
| 6 wk Δ | 2.2 ± 6.5 | -0.93 ± 10.0 | 0.35 ± 7.5 | 0.24 ± 10.0 | 0.027 | 0.476 |
| 12 wk Δ | 4.1 ± 7.6 | 10.1 ± 10.4 | 1.8 ± 7.3 | 4.3 ± 7.3 | 0.101 | 0.044 |
| 6 mo Δ | 7.3 ± 6.8 | 9.8 ± 9.3 | 4.2 ± 5.3 | 7.5 ± 7.6 | 0.053 | 0.331 |
| 1 year Δ | 9.0 ± 8.0 | 10.5 ± 10.9 | 4.9 ± 5.0 | 5.0 ± 5.0 | 0.055 | 0.388 |
| 2 year Δ | 9.9 ± 7.0 | 7.1 ± 8.5 | 2.3 ± 5.5 | 3.0 ± 11.7 | 0.156 | 0.048 |
aP value was calculated using linear regression (continuous) to compare each time point among subgroups.
BMI, body mass index; PROMIS-PF, Patient Reported Outcome Measurement Information System physical function.