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GRS grade per level
| Level treated | Grade A | Grade B | Grade C | Grade D | Grade E |
|---|---|---|---|---|---|
| L2 | 4 (1.4%) | 4 (1.4%) | 0 (0%) | 0 (0%) | 0 (0%) |
| L3 | 24 (8.2%) | 10 (3.4%) | 0 (0%) | 0 (0%) | 0 (0%) |
| L4 | 58 (19.9%) | 21 (7.2%) | 2 (0.7%) | 1 (0.3%) | 0 (0%) |
| L5 | 93 (31.8%) | 2 (0.7%) | 0 (0%) | 1 (0.3%) | 0 (0%) |
| S1 | 70 (24.0%) | 1 (0.3%) | 1 (0.3%) | 0 (0%) | 0 (0%) |
