Cephalometric Correlations

I'm doing some statistical analysis on a set of 152 Caucasoid individuals (on 9 variables) from Carleton Coon's The Races of Europe, and here are the most important variable correlations:

Upper Facial Height - Nasal Height 0.76
Facial Height - Upper Facial Height 0.71
Head Breadth - Bizygomatic 0.70
Bizygomatic - Bigonial 0.70
Minimum Frontal - Bizygomatic 0.58
Facial Height - Nasal Height 0.55
Head Breadth - Bigonial 0.49
Minimum Frontal - Bigonial 0.48

The PCA analysis seems to indicate that the first principal component is a general "size" factor positively associated with all cephalometric variables and accounting for 38% of the data variance. The other components seem to account for facial and cranial shape and nasal length.