Median overall survival by case-volume per year quartiles
| Case volume | Number | Median overall survival (mon) (95% CI) |
|---|---|---|
| Low | 4,280 | 20.7 (20.0, 21.3) |
| Intermediate | 4,058 | 21.8 (21.1, 22.6) |
| High | 4,323 | 22.8 (22.0, 23.7) |
| Very high | 4,388 | 25.9 (24.2, 26.1) |
OS, overall survival; CI, confidence interval.