Evaluation of Oxidative Stress Biomarkers in Patients with Fixed Orthodontic Appliances

Table 4

The results of Wilcoxon test to determine any significant difference between the periods in statistically significant parameters according to the Friedman test.

	Wilcoxon signed ranks test
	Pretreatment—1st month		Treatment 1st–6th month		Pretreatment—6th month
	𝑍	Sig.	𝑍	Sig.	𝑍	Sig.
IL-1β (GCF)	−1.78	0.074	−1.34	0.181	−3.05	0.002**
PI	−4.70	0.000***	−0.056	0.955	−4.41	0.000***
GI	−5.16	0.000***	−1.27	0.203	−5.48	0.000***
PD	−3.79	0.000***	−2.14	0.032*	−4.61	0.000***

^∗𝑃<0.05, ^∗∗𝑃<0.01, ^∗∗∗𝑃<0.001.