L (location) and B (behaviour) categories (%) of the Vienna classification at diagnosis according to age (A). There was no significant difference between subgroups A1 and A2
| A1 (n=248) | A2 (n=49) | |
| L1 | 43.6 | 51.1 |
| L2 | 26.1 | 29.8 |
| L3 | 25.6 | 17.0 |
| L4 | 4.7 | 2.1 |
| B1 | 75.8 | 63.8 |
| B2 | 9.5 | 17.1 |
| B3 | 14.7 | 19.1 |