Table 5.

Segmentation Error (Algorithm-Operator Difference in Pixels) on Raw Images of First and Second Testing Data Sets^a

Interface	Error With First Operatorb	Error With Second Operatorb	Error With Third Operatorc	Error With Fourth Operatorc	Mean Error
EP	2.46 ± 1.71	2.71 ± 2.17*	2.71 ± 2.42	3.60 ± 2.70**	2.84 ± 2.29
BS	4.44 ± 2.60	2.66 ± 2.40*	6.81 ± 4.26	5.23 ± 3.51**	4.66 ± 3.53
BW	2.00 ± 1.91	2.36 ± 2.28*	3.20 ± 3.14	2.50 ± 2.38**	2.47 ± 2.47
ST	3.12 ± 2.99	3.33 ± 3.35*	4.47 ± 3.57	3.92 ± 3.51**	3.61 ± 3.37
DM	8.53 ± 6.60	3.65 ± 5.70*	6.63 ± 4.84	4.07 ± 3.68**	5.79 ± 5.89
EN	3.97 ± 6.41	4.23 ± 5.66*	2.46 ± 2.23	4.01 ± 4.31**	3.78 ± 5.21
Mean	4.09 ± 4.74	3.16 ± 3.95*	4.34 ± 3.92	3.88 ± 3.48**	3.83 ± 4.11

^aFirst and second operators segmented the first testing data set, and the third and fourth operators segmented the second testing data set.

^b*P < 0.0001.

^c**P < 0.0001 (significance level = 0.05).