TABLE 2.

Correlations among oxidative stress markers at baseline (January 2020).

Biomarkers		TBARS	8 OH-2dG	8-isoprostanes	SOD activity	25(OH) vitamin D	Cell viability	Δψ	ROS	Thymosin β4
GSH	r	−0.178	−0.184	−0.072	−0.100	−0.239	−0.014	−0.019	−0.065	0.115
	p	0.173	0.160	0.583	0.448	0.066	0.917	0.888	0.621	0.383
TBARS	r	1.000	−0.163	−0.139	−0.163	0.097	0.149	0.034	0.123	−0.007
	p		0.213	0.289	0.214	0.463	0.256	0.798	0.348	0.959
8 OH-2dG	r		1.000	0.106	0.166	0.142	−0.075	0.234	0.042	0.159
	p			0.422	0.206	0.280	0.568	0.072	0.752	0.224
8-isoprostanes	r			1.000	0.491**	−0.024	0.031	−0.088	−0.014	−0.082
	p				0.001	0.857	0.814	0.504	0.918	0.532
SOD activity	r				1.000	0.023	0.047	0.173	−0.164	0.096
	p					0.864	0.721	0.187	0.211	0.464
25(OH) vitamin D	r					1.000	−0.164	−0.246	0.255*	0.038
	p						0.211	0.058	0.049	0.776
Cell viability	r						1.000	0.147	−0.125	0.010
	p							0.264	0.342	0.942
Δψ	r							1.000	−0.178	0.579**
	p								0.173	0.001
ROS	r								1.000	0.070
	p									0.597

GSH, glutathione; TBARS, thiobarbituric acid reactive substances; 8-OH-2dG, 8-hydroxy 2-deoxyguanosine; SOD, superoxide dismutase; Δψ, mitochondrial membrane potential; ROS, reactive oxygen species. *p < 0.05; **p < 0.001.