Associations Between Initial Glycated Hemoglobin at Diabetes Diagnosis, Longitudinal Changes and Medication Effects, and the Severity and Progression of Sight-Threatening Diabetic Retinopathy.

Although patients with higher comorbidity scores appeared to have slightly lower odds of developing severe DR, this association did not reach statistical significance, likely as a result of survivor bias, whereby patients with severe systemic comorbidities may have died before progressing to advanced stages of DR.

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