Table 5.

Paired samples test for preprocessing effect using ISIC 2018 dataset.

Variable			Mean	Std. Err.	Std. dev.	[95% CI]	t-value	df	Sig a
Accuracy	Pair 1	Without preprocessing	0.923	0.002	0.113	0.918–0.927	1.777	2593	0.076
		With artifact removal	0.921	0.002	0.114	0.917–0.926
	Pair 2	Without preprocessing	0.923	0.002	0.113	0.918–0.927	−0.096	2593	0.924
		With image enhancement	0.923	0.002	0.112	0.918–0.927
Dice	Pair 3	Without preprocessing	0.813	0.004	0.179	0.806–0.820	0.651	2593	0.515
		With artifact removal	0.812	0.003	0.178	0.806–0.819
	Pair 4	Without preprocessing	0.813	0.004	0.179	0.806–0.820	4.953	2593	0.000
		With image enhancement	0.803	0.004	0.189	0.795–0.810

Std. Err. = standard error; Std dev. = standard deviation; Sig = significance; ^a (2-tailed); CI = confidence interval; df = degrees of freedom.