Table 4. PPD 6 months after the treatment in both groups of patients.

PPD after 6 mo	Laser treatment	Surgical treatment
N	50	50
Average (mm)	2.78	2.95
SD	0.53	0.50
SEM	0.06	0.06
Minimum	2.00	2.00
Maximum	5.73	5.64

Abbreviations: PPD, periodontal pocket depth; SD, standard deviation; SEM, standard error of the mean.

Note: Kruskal–Wallis' test, p -value KW = 26.8, p  < 0.0001.