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Age distributions of cases according to outerbridge classification.
| Grade 0 | Grade 1 | Grade 2 | Grade 3 | Grade 4 | |
| Women | 39.81 ± 13.27(n = 67) | 44.60 ± 9.09 (n = 10) | 44.82 ± 8.08(n = 17) | 54.07 ± 9.32 (n = 14) | 53.72 ± 7.08(n = 29) |
| Men | 39.03 ± 13.87(n = 64) | 38.96 ± 10.03 (n = 25) | 50.11 ± 8.31 (n = 9) | 61 ± 10.52 (n = 4 ) | 55.19 ± 7.42(n = 16) |
n: The number of patients.
