Table 2.

Comparison of the SOD, GP, and MDA levels between the groups (% area, F, *: Welch-ANOVA test statistic; x: chi square, Kruskal-Wallis test statistic; SOD: superoxide dismutase; GP: glutathione peroxidase; MDA: malondialdehyde; SD: standard deviation, a:significant difference from the healthy group, b:significant difference from the periodontitis group

	Healthy Group	Periodontitis Group	Prophylaxis Group	Therapeutic Group	F, χ2	p
SOD Median	3.91	1.54	4.68ᵇ	4.44ᵇ	9.695x	0.021
(min; max)	(2.40; 4.86)	(0.88; 4.69)	(2.68; 6.94)	(2.83; 7.92)
GP Median	0.73	2.34	2.92ª	3.4ª	15.611x	0.001
(min; max)	(0.42; 2.64)	(0.99; 3.54)	(2.40; 5.77)	(2.61; 5.62)
MDA Mean ± SD	1.14 ± 0.54ᵇ	2.09 ± 0.56	4.35 ± 1.70ª	5.71 ± 2.46ª	15.817*	less than 0.001