Relative risk (HR) estimated from multiple Cox regression for the association between HbA_1c and development of diabetic retinopathy, adjusted for demographic variables.

<p>Results are presented as hazard ratios and their corresponding 95% confidence intervals. Time scale: duration of diabetes in years.</p><p>Example: HR for HbA_1c-MEDIAN for ten years of duration of diabetes: HR = 1.106*0.993¹⁰ = 1.031.