PROMIS PF and PHQ-9 score distribution by preoperative subgroup.
| Time Period | PROMIS ≥35 Mean ± SD (n) | PROMIS <35 Mean ± SD (n) | P Valuea |
| PROMIS | |||
| Preoperative | 40.2 ± 4.7 (55) | 30.2 ± 3.5 (64) | <0.001 |
| 6 weeks | 40.8 ± 6.5 (43) | 34.0 ± 5.6 (48) | <0.001 |
| 12 weeks | 43.5 ± 5.2 (33) | 39.0 ± 8.6 (38) | 0.011 |
| 6 months | 46.7 ± 5.8 (36) | 40.6 ± 7.2 (33) | <0.001 |
| 1 year | 48.3 ± 8.1 (24) | 41.0 ± 8.3 (31) | 0.002 |
| PHQ-9 | |||
| Preoperative | 5.4 ± 6.0 (55) | 8.3 ± 6.8 (64) | 0.018 |
| 6 weeks | 3.8 ± 5.4 (46) | 6.2 ± 5.7 (54) | 0.029 |
| 12 weeks | 2.4 ± 3.7 (38) | 4.5 ± 4.4 (53) | 0.017 |
| 6 months | 2.8 ± 4.2 (45) | 4.7 ± 5.3 (46) | 0.056 |
| 1 year | 2.8 ± 4.4 (24) | 4.7 ± 5.7 (31) | 0.180 |
Boldface indicates statistical significance (P < 0.05).
aP value was calculated using Student t test (continuous).
PF, Physical Function; PHQ-9, Patient Health Questionnaire-9; PROMIS, Patient-Reported Outcome Measurement Information System.