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| Children | Adults | Total | P | |
| n (%) | n (%) | n (%) | ||
| 6A/6B | 21 (19) | 12 (39) | 33 (23) | 0.029 |
| 15B/C | 11 (10) | 4 (13) | 15(11) | |
| 11A | 11 (10) | 1 (3) | 12 (8) | |
| 23F | 10 (9) | 1 (3) | 11 (8) | |
| 19F | 9 (8) | 0 (0) | 9 (6) | |
| 23A | 5 (5) | 0 (0) | 5 (4) | |
| 15A | 2 (2) | 3 (10) | 5 (4) | |
| Others | 22 (20) | 2 (6) | 24 (17) | |
| Un-typeable | 20 (18) | 8 (26) | 28 (20) | |
| Total | 111 (100) | 31 (100) | 142 (100) |
