Table 2.

Mean values (standard deviation) of area under ROC curve (Az), sensitivity and specificity distributed according to the variations of brightness and contrast

Variables	Brightness and contrast variations
V1	V2	V3	V4	V5
Accuracy (Az)	0.68 ± 0.07	0.66 ± 0.05	0.67 ± 0.05	0.67 ± 0.05	0.62 ± 0.06
Sensitivity	0.45 ± 0.17	0.45 ± 0.18	0.45 ± 0.18	0.41 ± 0.16	0.40 ± 0.24
Specificity	0.86 ± 0.13	0.84 ± 0.11	0.84 ± 0.18	0.89 ± 0.11	0.78 ± 0.24

ROC, receiver operating characteristic.

p > 0.05, according to ANOVA, post-hoc test.