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OSS Outcomes Classified According to Anchor-Based Groups
| Group | Minimum | Maximum | Mean (SD) | |
|---|---|---|---|---|
| Not importantly changed (n = 13) | Preoperative | 6 | 35 | 17.9 (9.6) |
| Postoperative | 17 | 47 | 33.3 (8.3) | |
| Difference | −6 | 33 | 15.4 (10.1) | |
| Importantly improved (n = 29) | Preoperative | 5 | 37 | 23.4 (8.1) |
| Postoperative | 31 | 48 | 43.2 (5.0) | |
| Difference | 5 | 36 | 19.7 (8.6) | |
