Table 2. .
Comparison of Two Superimposition Methods. Values are the Euclidean Distance (mm) Between the Positions of a Landmark in the Second Tracing, Which Is Oriented by Two Different Superimposition Methods for a Given Cephalometric Landmarka
| Difference Between Two Methods (eSN−ASM) |
H0: eSN−ASM < 1 mm |
||
| Mean |
SDb |
P Valuec |
|
| ANS | 3.3 | 3.8 | <.0001 |
| Point A | 4.0 | 4.7 | <.0001 |
| Point B | 3.6 | 4.2 | <.0001 |
| Pogonion | 2.8 | 3.3 | <.0001 |
| Gonion | 3.2 | 3.7 | <.0001 |
a
eSN−ASM stands for the difference between the SN and automated superimposition methods of landmark P, where P = Anterior Nasal Spine (ANS), Point A, Point B, Pogonion, and Gonion.
b
SD indicates standard deviation.
c
Results from t-tests under the null hypothesis if the error was less than 1 mm.