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Progression and regression rates
| Initial category | Final category | |||||
|---|---|---|---|---|---|---|
| 1 | 2 | 2F | 3 | 4 | Total | |
| 2F | 4 (2.6%) | 1 (0.7%) | 139 (92.1%) | 6 (4.0%) | 1 (0.7%) | 151 |
| 3 | 3 (7.7%) | 2 (5.1%) | 1 (2.6%) | 32 (84.8%) | 1 (2.6%) | 39 |
| 4 | 2 (11.1%) | 0 | 0 | 1 (5.6%) | 15 (83.3%) | 18 |
| Total | 9 | 3 | 140 | 39 | 17 | 208 |
