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Comparison of World Health Organization (WHO) grade of malignancy x age.
| WHO Histological Grading | Mean Age | Significance (p Value) |
|---|---|---|
| I | 11.8 | Median I and II (p > 0.05) Median I and III (p < 0.05) Median I and IV (p < 0.05) |
| II | 23.6 | Median II and III (p < 0.05) Median II and IV (p < 0.05) |
| III | 42.8 | Median III and IV (p > 0.05) |
| IV | 51.7 | - |
