Table 2. Quantitative change evaluation metrics per clinical target volume levels.

CTV level	All Physicians (n=84)	Experienced (n=59)	Junior (n=25)	P Value
CTV1
VD	–0.05 ± 0.13	–0.06 ± 0.10	–0.03 ± 0.18	.155
DSC	0.94 ± 0.09	0.95 ± 0.07	0.93 ± 0.13	.825
FND	0.09 ± 0.16	0.09 ± 0.12	0.10 ± 0.23	.668
FPD	0.03 ± 0.07	0.02 ± 0.05	0.05 ± 0.11	.932
CTV2
VD	0.39 ± 2.91	0.05 ± 0.29	1.15 ± 5.21	.613
DSC	0.84 ± 0.23	0.87 ± 0.19	0.76 ± 0.29	.041
FND	0.14 ± 0.24	0.12 ± 0.20	0.21 ± 0.31	.320
FPD	0.18 ± 0.33	0.14 ± 0.23	0.27 ± 0.49	.401
CTV3
VD	–0.02 ± 0.32	0.01 ± 0.28	–0.07 ± 0.39	1.000
DSC	0.87 ± 0.20	0.90 ± 0.18	0.80 ± 0.22	.006
FND	0.17 ± 0.34	0.11 ± 0.27	0.28 ± 0.43	.029
FPD	0.10 ± 0.17	0.09 ± 0.18	0.12 ± 0.17	.093

Abbreviations: CTV = clinical target volume; DSC = Dice similarity coefficient; FND = false negative Dice; FPD = false positive Dice; VD = volumetric difference.

Data represent means ± standard deviations.

P values were calculated with the Wilcoxon rank sum test to assess differences between experienced and junior physician contours.