BOX 2-1

FACIAL DIMENSIONS MEASURED IN THE NIOSH-SPONSORED ANTHROTECH STUDY

Bigonial breadth: The straight line distance between right and left gonion landmarks (see Box 2-2) on the cor-ners of the jaw

Bitragion coronal arc: The surface distance between the right and left tragion landmarks (see Box 2-2) across the head in the coronal plane

Bitragion subnasale arc: The surface distance between the left and right tragion landmarks across the subna-sale landmark (see Box 2-2) at the bottom of the nose

Bitragion chin arc: The surface dis-tance between the left and right tragion landmarks across the anterior point of the chin



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