Table 5. Classification functions between non-diabetics without retinopathy, T2DM patients without DR and T2DM patients with DR in the case-control study.

Parameters	Non-diabetics without retinopathy	T2DM without DR	T2DM with DR
Vitamin C (mg/dL)	2.362	0.899	1.785
Vitamin D (mmol/L)	0.259	0.074	0.012
ApoB	1.478	1.380	2.128
8-OHdG (mg/mL)	0	0.056	0.088
Creatinine (mg/dL)	1.016	1.339	1.378
Zn	0.278	0.175	0.193
Vitamin E (mmol/L)	1.443	0.888	0.829
WC (cm)	0.398	0.488	0.482
Constant	-100.211	-91.118	-93.379

Excluded from the Fisher's linear discriminant functions: Se, non HDL, OxLDL, TC, 8-isoprostane, SOD, age, HDL-C, TBARS, GGT, Homa-IR, BMI, TAOS and post migration living time in town.