| Centiles M3 | |||||||
| Age | 56 | 10 | 25 | 50 | 75 | 90 | 95 |
| 7½ | 5.6 | 7.5 | 10.1 | 13.4 | 16.2 | 18.2 | 20.7 |
| 8½ | 8.6 | 11.4 | 14.9 | 18.9 | 22.3 | 26.0 | 27.1 |
| 9½ | 14.5 | 15.3 | 16.2 | 18.3 | 22.2 | 26.7 | 28.2 |
| 10½ | 14.1 | 14.8 | 17.5 | 20.2 | 22.7 | 30.0 | 32.5 |
| 11½ | 14.4 | 15.7 | 18.1 | 22.8 | 25.1 | 28.0 | 29.7 |