Table 1. Head positioning computed tomography study.

	Average +/− standard deviation (n = 30)
Distance to foramen magnum parallel to palate (mm)	126.5
Distance to transition between lower and middle clivus (mm)	117.4
Angle from midclivus to hard palate (degree)	10.6
Distance to dorsum sellae to posterior clinoid (mm)	116.1
Angle from posterior clinoid to hard palate (degree)	21.5
Distance to tuberculum sellae (planum) (mm)	103.4
Angle from planum to hard palate (degree)	25.1
Distance to midpoint cribriform (mm)	78.9
Angle from midpoint of cribriform to hard palate (degree)	34.3