Table 2.

Comparison of relationships about the lateral most portion of the EAC.

Relationship	Average Pediatric Angle (SD)	Average Adult Angle (SD)	P value
LatEAC:⊥TM	136.57 (1.08)	172.20 (1.15)	0.003
LatEAC:⊥RW	43.41 (1.09)	52.34 (1.17)	0.009
LatEAC:⊥FR	10.06 (0.81)	14.42 (0.87)	<0.001
LatEAC:TRJ	23.51 (2.47)	19.40 (2.65)	<0.001

(SD=standard deviation; LatEAC=center line of the external auditory canal; ⊥TM =line perpendicular to the tympanic membrane; ⊥RW =line perpendicular to the plane of the round window; ⊥FR =line perpendicular to the facial recess; TRJ=ideal drilling trajectory for cochleostomy)