
Figure 1
Writing hand plotted against year of birth: after National Geographic.
| Canada | 11.5 |
| UK | 11.5 |
| United Arab Emirates | 7.5 |
| India | 5.8 |
| Japan | 4.0 |
| Ivory Coast | 7.9 |
| Sudan | 5.1 |

Figure 2
Manual skill test for handedness: after Tapley and Brandon.
© 2021 John Welch, published by American Society of Questioned Document Examiners
This work is licensed under the Creative Commons Attribution 4.0 License.