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Prevalences of grades for the Lee system
| Observer | Grade 0 (%) | Grade 1 (%) | Grade 2 (%) | Grade 3 (%) | Total (%) |
| Reader 1 | 30 (19) | 75 (47) | 27 (17) | 28 (18) | 160 (100) |
| Reader 2 | 30 (19) | 76 (48) | 33 (21) | 21 (13) | 160 (100) |
The percentage values in parentheses were rounded up.
