Laser Treatment for Melanin Gingival Pigmentations: A Comparison Study for 3 Laser Wavelengths 2780, 940, and 445 nm

Table 8

Statistical analysis of correlation (Kruskal–Wallis and chi-squared tests were also used to determine the correlation between the independent groups).

Test statistics
	Bleeding directly after surgery	Color improvement	Pain is scored using VAS index	Satisfaction with treatment after 6 months	Wound healing after 10 days	Relapse after two years	Duration of the procedure measured in minutes
Chi-squared	4.573	1.943	16.651	1.441	1.208	3.191	23.679
Df	2	2	2	2	2	2	2
Asymp Sig.	0.102	0.379	0.000	0.487	0.547	0.203	0.000