The relationship between jaw,arm and leg size in three ethnic groups

Overall height, arm length, leg length and mandibular size were measured in 800 male subjects from three ethnic groups aged three months to 20 years. Mandibular size or limb size showed a linear relationship when plotted against overall body height for each ethnic group and emphasized that different relationships exist between the size of a region and that of the body as a whole in caucasoids, negroids and mongoloids.