Table 3. A comparison of the response to treatment between patients with dark brown and light brown hyperpigmentation.

Characteristic	Dark brown hyperpigmentation	Light brown hyperpigmentation	p-value
Number of patients	6	4
Disease duration (mo)	11.2±8.6	57.0±43.1	0.01
Number of patients who reached grade 3 improvement	6 (100)	3 (75)	0.40
Number of patients who reached grade 4 improvement	6 (100)	1 (25)	0.03
Treatment sessions for grade 1 improvement	2.7±0.8 (2~4)	7.3±2.6 (5~11)	0.01
Treatment sessions for grade 2 improvement	7.2±3.2 (4~12)	12.0±3.0 (9~15)	0.10
Treatment sessions for grade 3 improvement	10.5±3.5 (6~15)	15.3±2.9 (12~17)	0.10
Treatment sessions for grade 4 improvement	14.3±4.8 (9~20)	16	0.86

Values are presented as number only, mean±standard deviation, number (%), or mean±standard deviation (range).