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| Grade | Number of subjects | Median hepatic iron concentration (μmol g–1) | 25th percentile (μmol g–1) | 75th percentile (μmol g–1) | Range (μmol g–1) | Mean hepatic iron concentration (μmol g–1) |
| 0 | 28 | 32.6 | 13.7 | 46.6 | 9.4–63.8 | 31.6 |
| 1 | 18 | 115.0 | 87.0 | 140.8 | 43.8–150.6 | 109.6 |
| 2 | 22 | 198.0 | 187.1 | 251.6 | 152.2–325.0 | 219.3 |
| 3 | 16 | 318.0 | 284.5 | 325.0 | 270.9–325.0 | 306.8 |
