Table 2. Blood and plasma levels of vitamins B1, B2, B6 and folic acid of control (CN) and diabetes patients without (DNR) and with retinopathy (DR).

Vitamin	CN	DNR	DR	F Value	P-values
B1 (ng/mL)	67.6±3.1an = 45	70.1±3.8bn = 45	67.2±3.0abn = 45	3.9	0.024
B2 (ng/mL)	231±9.3an = 45	248±8.2an = 45	238±7.0an = 45	1.99	0.143
B6 (ng/mL)	20.6±1.3an = 45	13.0±1.1bn = 45	14.6±1.0bn = 60	10.1	0.000
Folic acid (ng/mL)	10.0±0.9an = 75	7.8±0.6abn = 75	7.2±0.4bn = 150	4.7	0.009

Note: 1. Values are Mean ± SD.

2. Mean values across groups were compared by oneway ANOVA ‘F’ test with post hoc test of Tukey's multiple comparisons.

3. Significant differences (p<0.05) of mean values between the groups are indicated by different superscript letters.