| Code | Definition | Number of Accessions |
| 1 | INFERIOR | 11 |
| 2 | (1 = INFERIOR, 9 = SUPERIOR) | 15 |
| 3 | (1 = INFERIOR, 9 = SUPERIOR) | 64 |
| 4 | (1 = INFERIOR, 9 = SUPERIOR) | 112 |
| 5 | (1 = INFERIOR, 9 = SUPERIOR) | 191 |
| 6 | (1 = INFERIOR, 9 = SUPERIOR) | 114 |
| 7 | (1 = INFERIOR, 9 = SUPERIOR) | 97 |
| 8 | (1 = INFERIOR, 9 = SUPERIOR) | 40 |
| 9 | SUPERIOR | 29 |