Table 2.
Comparison of study cohort to patients without 1-year PROM data
| Comparison | Study cohort | Missing 1-year data | p value* |
|---|---|---|---|
| Number of patients | 537 | 256 | |
| Preoperative HOOS† | 43.4 (17.5) | 41.0 (18.5) | 0.155 |
| Preoperative SF12v2 PCS | 30.8 (9.5) | 28.7 (8.4) | 0.453 |
| Preoperative SF12v2 MCS | 48.5 (12.3) | 47.1 (13.5) | 0.802 |
| Postoperative HOOS | 83.1 (18.2) | 78.0 (21.5)‡ | 0.146 |
| Postoperative SF12v2 PCS | 43.6 (12.2) | 39.8 (12.3)‡ | 0.001 |
| Postoperative SF12v2 MCS | 51.7 (10.5) | 51.2 (10.6)‡ | 0.175 |
* To compare the mean PROM scores of the study cohort to the mean PROM scores of those without 1-year data, a Student’s t-test was used.
†mean (SD).
‡includes patients with at least one postoperative PROM score available (but missing 1-year PROM data); this group represented 38% (n = 98) of the total patients not included in the study cohort; postoperative PROM scores included in the mean were those available from latest followup; this ranged from 2 to 4 years postoperatively; PROM = patient-reported outcome measure; HOOS = Hip Disability and Osteoarthritis Outcome Score; SF12v2 = SF-12 version 2; PCS = physical component summary; MCS = mental component summary.