TABLE 3.

Measurement Precision Estimates $\left(\overline{P_L}\right)$ for Landmark Placement on Computed Tomography Reconstructions^*

Landmark	$\left(\overline{P_L}\right)$(mm)
ACP	0.48
AST	0.43
BAS	0.30
BRG	1.46†
EAM	0.79
FOV	0.75
FZJ	0.40
HYP	0.31
IAM	0.45
IPF	0.82
JUG	1.01†
LAM	0.38
NAL	0.40
NAS	0.55
OPI	0.21
PTA	1.05†
PTP	2.29†
SEL	0.34
SSQ	1.57†
VSJ	0.58
ZMS	0.82

^*Precision values ($\left(\overline{P_L}\right)$) for all landmarks considered in the error study (K = 34; eight midline and 13 bilateral landmarks). These values estimate the average measurement error for placement of a landmark (in millimeters). Error data for right and left bilateral landmarks are incorporated in a single value.

^†Landmarks with error between 1 mm and 2.5 mm, constituting fewer than 25% of the landmarks under consideration. Error estimates for all landmarks were less than 2.5 mm.