Table 2.

Comparison of absolute error values of X, Y, Z, and T between the two groups (mm)and the median (first and third quartiles).

Characteristic	Observation group N=208	Control group N=206	P-value1
X	1.9(0.90,2.73)	2.3(1.1,3.6)	<0.001
Y	2.5(1.48,3.7)	3.5(2.1,5.4)	<0.001
Z	1.4(0.78,2.3)	1.8(0.9,3.1)	0.003
T	3.97(3.08,5.32)	5.51(4.18,7.25)	<0.001

¹Wilcoxon rank-sum test; N: Image-registration times; p < 0.05, statistically significant.