Figure 1. Box and whisker plot showing median and interquartile range for distribution of serum prolactin levels [nanogram per milliliter (ng/ml)] in the four groups [NoDR: no retinopathy (n=15), NPDR: non-proliferative diabetic retinopathy (n=16), PDR: proliferative diabetic retinopathy (n=15) and controls (n=15)] showing decrease in serum prolactin levels with severity of diabetic retinopathy.