Figure 7. Relationship between the severity of diabetic retinopathy (DR) and the aqueous interleukin-10 (IL-10) level. The results by measuring cytokines in the aqueous humor samples shows that the IL-10 level in aqueous humor decreased with increasing severity of DR, and this correlation was significant (r=–0.206, p=0.016). Table 4 shows the sampling sizes for each group according to the ETDRS retinopathy severity scale.