Table 3.

The distances from predicted keyhole position to the T/S junction

References		Caudal	Lateral
Lang and Samii (1991)2)	Average 30 mm behind the suprameatal spine on the FHP	−3.4 ± 6.5	1.9 ± 3.5*
Ribas et al. (2005)4)	1 cm anterior to the asterion across the parietomastoid suture	4.6 ± 3.7	−1.5 ± 7.9*
Our cases	6.5 mm inferior, 6.5 mm lateral to the asterion	−0.8 ± 3.3	0.1 ± 2.8

Values are means (mm) ± standard deviation (SD).

^*p < 0.05. FHP: Frankfurter horizontal plane.