Figure 2. Box and whisker plot showing median and interquartile range for distribution of serum cortisol levels [microgram per deciliter (µg/dl)] 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 increase in serum cortisol levels with severity of diabetic retinopathy.