Figure 3 Results from the Wisconsin Epidemiologic Study of Diabetic Retinopathy (WESDR) and the North Jutland County Diabetic Retinopathy Study (NCDRS) are compared with respect to glycated haemoglobin (HbA1c) and blood pressure (systolic and diastolic, SBP and DBP, respectively) on prevalence (Preval) of proliferative retinopathy (prol ret) and clinically significant macular oedema (mac). The ratio between medians is depicted, WESDR being reference—that is, a value >1 indicates a higher median in the NCDRS.