Table 3

The agreement scores of each feature generated from segmentation results by all users, JSEG and the gold standard, assessed by ICC

Features	All 7 physicians	GP 1 vs gold	GP 2 vs gold	GP 3 vs gold	GP 4 vs gold	JSEG vs gold
PC3*	0.96	0.97	0.97	0.99	0.98	0.95
Variance blue channel*	0.88	0.89	0.90	0.95	0.92	0.84
Variance blue channel†	0.97	0.97	0.97	0.99	0.98	0.98
Compactness*	0.57	0.52	0.57	0.70	0.64	0.13
Radial variance*	0.63	0.67	0.60	0.75	0.58	0.29
Green–blue correlation*	0.77	0.87	0.77	0.80	0.87	0.65
Green–grey correlation*	0.80	0.88	0.82	0.88	0.87	0.66
PC3†	0.98	0.98	0.97	0.99	0.99	0.95
Entropy red channel†	0.90	0.94	0.89	0.95	0.90	0.93
Entropy red channel*	0.92	0.96	0.90	0.97	0.94	0.86
Entropy blue channel†	0.93	0.93	0.94	0.97	0.96	0.94
Entropy blue channel*	0.88	0.93	0.88	0.94	0.90	0.82
GLRLM_HGRE_4Level†	0.84	0.91	0.77	0.93	0.87	0.86
GLRLM_SRLGE_4Level†	0.95	0.96	0.95	0.98	0.97	0.93
GLRLM_SRLGE_2Level†	0.94	0.94	0.94	0.97	0.95	0.94
Tamura's coarseness features*	0.94	0.93	0.93	0.97	0.95	0.91
Probability score	0.91	0.91	0.90	0.94	0.93	0.48

Features are listed in order according to RFE ranking between 91 features in our previous study. All of the p values of each ICCs in this table are ≤0.01. The failure cases (34/347) of autosegmentation by JSEG are not included in the analysis.
*Derived from the lesion area only.
†Derived from the whole cropped image.
GLRLM, grey level run length matrix; GP, general practitioner; HGRE, high grey level run emphasis; ICC, intraclass correlation coefficient; PC3, the variance along the coordinates of the third principal components; RFE, recursive feature elimination; SRLGE, short run low grey level emphasis.