Table 4.

Paired samples test for preprocessing effect using PH2 dataset.

Variable			Mean	Std. Err.	Std. dev.	[95% CI]	t-Value	df	Sig a
Accuracy	Pair 1	Without preprocessing	0.921	0.009	0.127	0.903–0.939	2.043	199	0.042
		With artifact removal	0.919	0.009	0.130	0.901–0.938
	Pair 2	Without preprocessing	0.921	0.009	0.127	0.903–0.939	−3.9213	199	0.000
		With image enhancement	0.933	0.008	0.118	0.917–0.950
Dice	Pair 3	Without preprocessing	0.893	0.007	0.105	0.878–0.908	0.953	199	0.342
		With artifact removal	0.891	0.008	0.106	0.876–0.906
	Pair 4	Without preprocessing	0.893	0.007	0.105	0.878–0.908	−4.0814	199	0.000
		With image enhancement	0.909	0.007	0.942	0.896–0.922

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