Table 2

Threshold ranges for diabetes-specific retinopathy (moderate NPDR or more severe retinopathy) derived from logistic regression models (adjusted for center) of the glycemic measures by continuous distribution and vigintile distribution and ROC curve analysis

FPG (mmol/l)2-h PG (mmol/l)A1C (%)
Logistic regression
    Continuous distribution6.5–6.9No threshold6.5–6.9
    Vigintile distribution6.4–6.89.8–10.66.3–6.7
ROC curve analysis6.613.06.4