Changes and significance of retinal blood oxygen saturation and oxidative stress indexes in patients with diabetic retinopathy

Table 3 Comparison of serum oxidative stress indexes in patients with different diabetic retinopathy stages (mean ± SD)

Disease classification	Simple (n = 56)	Proliferative (n = 38)	t value	P value
MDA (μmol/L)	6.11 ± 1.38	9.55 ± 1.43	-11.688	< 0.05
8-HdG (ng/mL)	90.53 ± 20.54	132.51 ± 19.82	-9.862	< 0.05
SOD (U/L)	83.02 ± 11.68	54.10 ± 13.01	11.249	< 0.05
GSH (mg/L)	187.46 ± 32.74	128.96 ± 26.74	9.135	< 0.05

MDA: Serum malondialdehyde; 8-HdG: 8-hydroxydehydroguanosine; SOD: superoxide dismutase; GSH: Reduced glutathione.