Table 6. GI 6 months after the treatment in both groups of patients.

GI after 6 mo	Laser treatment	Surgical treatment
N	50	50
Average (0–3)	0.16	0.28
SD	0.40	0.45
SEM	0.04	0.05
Min	0.00	0.00
Max	2.33	2.20

Abbreviations: GI, gingival index; SD, standard deviation; SEM, standard error of the mean.

Note: Kruskal–Wallis' test, p -value KW = 11.0, p  = 0.004.