Table 5.

ΔE values for each shade of the treatment group and the control group (n = 19).

	Treatment	Control	p
Data in median (first quartile-third quartile)
A1	4.39 [2.36–5.76] n = 52	3.60 [2.03–5.48] n = 60	0.209
A2	3.97 [2.89–5.09] n = 24	3.18 [1.77–5.17] n = 47	0.206
A3	4.69 [2.43–8.10] n = 21	5.15 [4.27–7.28] n = 13	0.425
A3.5	4.08 [3.33–7.06] n = 19	2.36 [1.74–4.08] n = 16	0.004
A4	7.28 [2.98–10.57] n = 4	8.08 [4.75–11.97] n = 7	0.705
B1	5.12 [2.31–12.99] n = 20	4.82 [3.70–9.23] n = 11	0.741
B2	3.95 [2.28–6.53] n = 37	3.31 [1.80–6.44] n = 28	0.529
B3	4.30 [2.86–7.86] n = 36	3.71 [2.57–5.96] n = 40	0.206

^∗ p < 0.05 (test of Mann–Whitney): treatment vs. controls.