Figure 2. Relationship between the severity of diabetic retinopathy (DR) and the aqueous interleukin-6 (IL-6) level. The results by measuring cytokines in the aqueous humor samples shows that the IL-6 level in aqueous humor increased with increasing severity of DR, and this correlation was significant (r=0.468, p<0.001). Table 3 shows the sampling sizes for each group according to the ETDRS retinopathy severity scale.