Figure 2. Percentage distribution of aldose reductase activity levels. Aldose reductase (ALR2) activity is distributed into <3, 3–6, 6–9, and >9 units/g Hb subgroups in nondiabetic control, and diabetics without diabetic retinopathy (DNR), and diabetics with diabetic retinopathy (DR). Percentage distribution of ARL2 activity with <3 units is significantly (p<0.05) different between the groups. Percentage distribution of ARL2 activity with >9 units is significantly (p<0.05) different between DNR and DR groups.