Table 5.

Facial dimension measured in the NIOSH‐sponsored Anthrotech study

	Facial dimension	Definition
	Bigonial breadth	The straight‐line distance between right and left gonion on the corners of the jaw
	Bitragion subnasale arc	The surface distance between the left and right tragion at the bottom of the nose
	Bitragion chin arc	The surface distance between the left and right tragion across the anterior point of the chin
	Head breadth	The maximum horizontal breadth of the head above the level of the ears
	Menton‐sellion length	The distance in the midsagittal plane between the menton at the bottom of the chin and at the deepest point of the nasal root depression
	Nose breadth	The straight‐line distance between the right and left on the sides of the nostrils
	Chin	The protruding point on the bottom edge of the chin, along the jaw line