Average Preoperative and Postoperative Scores Stratified by Body Mass Index Cohort
| Postoperative Follow-Up Time Point | |||||||
|---|---|---|---|---|---|---|---|
| Outcome Measure/Body Mass Index Cohort | Preoperative Baseline | 6 weeks | 3 months | 6 months | 1 year | 2 years | 3 years |
| Harris Hip Score | |||||||
| Underweight | 58.0 | 78.1 (0.020) | 80.2 (0.001) | 85.9 (0.076) | 81.0 (0.011) | 73.2 (0.008) | 68.2 (0.046) |
| Normal weight | 56.3 | 76.7 (<0.001) | 74.0 (<0.001) | 92.5 (<0.001) | 88.5 (<0.001) | 86.3 (<0.001) | 73.9 (<0.001) |
| Overweight | 50.6 | 80.5 (<0.001) | 77.9 (<0.001) | 89.8 (<0.001) | 87.4 (<0.001) | 82.0 (<0.001) | 75.9 (<0.001) |
| Obese | 54.7 | 75.9 (<0.001) | 79.5 (<0.001) | 90.2 (<0.001) | 91.7 (<0.001) | 87.8 (<0.001) | 82.2 (<0.001) |
| Intercohort P valuea | 0.245 | 0.914 | 0.989 | 0.576 | 0.884 | 0.444 | 0.448 |
| Physical Component Score of 12-Item Short Form Survey | |||||||
| Underweight | 37.1 | 38.0 (0.494) | 44.2 (0.008) | 43.7 (0.016) | 46.9 (0.024) | 48.4 (0.022) | 49.0 (0.061) |
| Normal weight | 35.6 | 38.2 (0.002) | 44.9 (<0.001) | 49.4 (0.001) | 49.6 (<0.001) | 50.1 (<0.001) | 51.4 (<0.001) |
| Overweight | 34.6 | 38.4 (0.001) | 43.4 (<0.001) | 46.7 (<0.001) | 48.3 (<0.001) | 49.1 (<0.001) | 51.8 (<0.001) |
| Obese | 34.2 | 47.5 (0.079) | 42.9 (<0.001) | 46.7 (<0.001) | 49.2 (<0.001) | 51.1 (<0.001) | 53.6 (<0.001) |
| Intercohort P valuea | 0.542 | 0.186 | 0.639 | 0.796 | 0.758 | 0.765 | 0.661 |
| Mental Component Score of 12-Item Short Form Survey | |||||||
| Underweight | 48.0 | 52.4 (0.049) | 53.4 (0.059) | 47.7 (0.353) | 58.0 (0.026) | 57.2 (0.022) | 55.5 (0.056) |
| Normal weight | 49.5 | 53.4 (0.001) | 55.1 (<0.001) | 54.6 (<0.001) | 54.9 (<0.001) | 54.5 (<0.001) | 55.4 (<0.001) |
| Overweight | 51.2 | 53.3 (0.004) | 55.0 (<0.001) | 54.3 (0.010) | 54.9 (0.049) | 55.4 (0.071) | 56.3 (0.119) |
| Obese | 50.9 | 53.7 (0.017) | 54.9 (0.030) | 54.9 (0.027) | 55.9 (0.010) | 56.4 (0.079) | 59.0 (0.095) |
| Intercohort P valuea | 0.519 | 0.984 | 0.927 | 0.269 | 0.669 | 0.671 | 0.318 |
↵aIntercohort P values calculated by analysis of variance to compare the mean values of the 4 body mass index cohorts.
Notes: Data are presented as mean score (P value compared to preoperative score) unless otherwise indicated. The Harris Hip Score, the physical component score of the 12-Item Short Form Survey, and the mental component score of the 12-Item Short Form Survey each has a maximum score of 100, with higher values indicating better outcomes. Body mass index cohorts were defined as follows: underweight, <18.5 kg/m2; normal weight, 18.5 to 24.9 kg/m2; overweight, 25.0 to 29.9 kg/m2; obese, ≥30.0 kg/m2.