Figure 6. Relationship between the severity of diabetic retinopathy (DR) and the aqueous vascular endothelial growth factor (VEGF) level. The results by measuring cytokines in the aqueous humor samples shows that the VEGF level in aqueous humor did not increase with increasing severity of DR, and this correlation was not significant (r=0.161, p=0.062). Table 3 shows the sampling sizes for each group according to the ETDRS retinopathy severity scale.