TABLE 2.

The average of the head movement in each direction (x, y, z) and angular rotation on each axis (pitch, roll, and yaw) during 600 scanning.

	Drif_NO	Drif_C	Drif_CR	Sig. (p)
x-axis: mm (×10–2)	0.72 ± 0.50	0.26 ± 0.24	0.24 ± 0.22	0.001*
				0.001*
Max value	5.36 ± 3.39	1.45 ± 1.13	2.70 ± 1.95	1.000
y-axis: mm (×10–2)	4.34 ± 2.29	0.85 ± 0.57	0.64 ± 0.57	<0.001*
				<0.001*
Max value	18.62 ± 16.39	4.52 ± 2.36	4.64 ± 3.52
				1.000
z-axis: mm (×10–2)	6.15 ± 3.89	1.59 ± 1.63	1.26 ± 1.44	<0.001*
				<0.001*
Max value	28.97 ± 18.13	7.67 ± 5.18	8.62 ± 7.48
				1.000*
Pitch: degree (×10–3)	0.57 ± 0.19	0.13 ± 0.05	0.11 ± 0.06	<0.001*
				<0.001*
Max value	2.95 ± 1.34	0.83 ± 0.38	1.81 ± 2.52
				1.000
Roll: degree (×10–3)	0.25 ± 0.15	0.08 ± 0.08	0.07 ± 0.07	<0.001*
				<0.001*
Max value	1.79 ± 1.41	0.46 ± 0.33	1.08 ± 0.73
				1.000
Yaw: degree (×10–3)	0.16 ± 0.06	0.05 ± 0.03	0.04 ± 0.02	<0.001*
				<0.001*
Max value	1.11 ± 0.47	0.29 ± 0.15	0.41 ± 0.37
				1.000

In Sig (p) column, the value in the upper, middle, and lower row indicates Drif_NO vs. Drif_C, Drif_NO vs. Drif_CR, and Drif_C vs. Drif_CR, respectively. ^∗indicates significant difference by Bonferroni post hoc analysis.