Table 1: ∆E statistics according to group and time of evaluation.
Group 
∆E (Baseline X Final) Average ± DP Median (P25; P75) 
∆E (Final X 15 days after) Average ± DP Median (P25; P75) 
PC (n = 10)

11.06 ± 4.66 ^{(A)} 
3.22 ± 3.08 
11.25 (8.57; 15.29) 
3.02 (1.30; 3.66) 

PC+ (n = 10)

7.57 ± 3.93 ^{(AC)} 
4.88 ± 2.43 
6.84 (4.94; 10.55) 
4.44 (2.93; 5.93) 

GC (n = 10)

2.90 ± 2.33 ^{(B)} 
3.32 ± 2.30 
2.26 (1.44; 4.26) 
2.54 (1.78; 4.57) 

LW (n = 10)

4.35 ± 2.29 ^{(BC)} 
3.36 ± 1.67 
4.20 (2.20; 6.08) 
3.54 (2.00; 4.82) 

LW+ (n = 10)

3.30 ± 1.83 ^{(B)} 
4.86 ± 3.19 
3.21 (1.58; 4.55) 
4.27 (2.03; 7.58) 

Value of p 
P^{(1)} < 0.001^{*} 
p^{(2)} = 0.234 
(*)Significant difference at 5.0%.
^{(1)}Through the F test (ANOVA) with Tukey's comparisons.
^{(2)}Through the Kruskal Wallis test.
PS. If all the letters between parentheses are distinct it is verified significant differences between the corresponding groups.