| Variable | No. | % |
| EHL grading | ||
| Grade 1 | 1 | 3.3 |
| Grade 2 | 4 | 13.3 |
| Grade 3 | 11 | 36.7 |
| Grade 4 | 12 | 40.0 |
| Grade 5 | 2 | 6.7 |
| Total | 30 | 100.0 |
| FHL grading | ||
| Grade 1 | 0 | - |
| Grade 2 | 4 | 13.4 |
| Grade 3 | 10 | 33.3 |
| Grade 4 | 9 | 30.0 |
| Grade 5 | 7 | 23.3 |
| Total | 30 | 100.0 |