Risk factor commonality coefficient % Total Unique to age 0.0386 23.92 Unique to SBP 0.0046 2.84 Unique to HbA1c 0.0404 25.07 Unique to duration of diabetes 0.0358 22.23 Common to age and SBP -0.0018 -1.14 Common to age and HbA1c 0.0398 24.68 Common to SBP and HbA1c 0.0016 1.00 Common to  age and duration of diabetes -0.01 -6.18 Common to  SBP and duration of diabetes 0.00 0.00 Common to  HbA1c and duration of diabetes 0.0216 13.43 Common to age, SBP and HbA1c -0.0011 -0.7 Common to age, SBP, and duration of diabetes -0.0004 -0.28 Common to age, HbA1c, and duration of diabetes -0.0087 -5.38 Common to SBP, HbA1c, and duration of diabetes -0.0003 -0.21 Common to age, SBP, HbA1c, and duration of diabetes 0.0012 0.73 Total (%) 0.1612 100 Note: Commonality coefficient identifying suppression underlined. DME: Diabetic Macular Edema; HbA1c: Haemoglobin A1c; SBP: Systolic Blood Pressure Σ Commonality coefficient = multiple R2 % Total= (Commonality coefficient)/(multiple R2) Unique variance=x’s unique variance; Common=common variance; Total=Unique+Common;

Table 4: Commonality matrix of risk factors for diabetic macular edema (DME) in patients with type 2 diabetes.