Table 3. Percentages of principal component (PC) explained variances in both shape and form space, and percentages of accounted variance by selected independent variables yielded by the multivariate regressions (natural logarithm of centroid size lnCS, sex, and geographic origin).
| PCA in shape space | PC1 | PC2 | PC3 |
| Complete sample | 22.6 | 16.4 | 8.9 |
| Europeans | 30.5 | 14.1 | 8.4 |
| Africans | 30.0 | 15.8 | 9.3 |
| PCA in form space | PC1 | PC2 | PC3 |
| Complete sample | 40.3 | 13.3 | 9.8 |
| Europeans | 36.8 | 19.3 | 8.5 |
| Africans | 51.3 | 15.6 | 6.2 |
| Multivariate regression of shape variables | lnCS | Sex | Geographic origin |
| Complete sample | 1.7 | 2.2 | 3.7 |
| Europeans | 3.6 | 6.6 | - |
| Africans | 6.5 | 9.1 | - |
Abbreviation: PC, principal component; lnCS, natural logarithm of centroid size.