Patients ΔE P-value*
Mean (SD)
Healthy 1.05 (0.85)A < 0.001
Cancer Non-operated site 2.94 (2.2)B < 0.001
Operated site 5.71 (4)C < 0.001

*The data were not normally distributed (Shapiro-Wilk test, P < 0.05).
A-CThe different superscript letters indicate statistically significant (P < 0.05) differences between the groups (Kruskal-Wallis test and Dunn's post-hoc test).
ΔE = colour blending deviation; SD = standard deviation.