Table 1.

Participants’ characteristics at baseline

Baseline features	Groups
	HP 37.5%	HP 6%
Age (years; mean ± SD)	27 ± 7.5
Minimum age (years)	20
Maximum age (years)	54
Male (%)	52%
*L (mean ± SD)	84.41 ± 2.95	86.17 ± 2.81
*a (mean ± SD)	0.08 ± 1.06	0.15 ± 1.24
*b (mean ± SD)	27.96 ± 3.18	28.42 ± 3.68
Baseline Vita bleach SGU median (min:max)	9 (7:11)	9 (7:11)
Baseline Vita classical SGU median (min:max)	9 (9:12)	9 (9:12)

SD Standard deviation