Research Article

Metformin Treatment Is Associated with a Decreased Risk of Nonproliferative Diabetic Retinopathy in Patients with Type 2 Diabetes Mellitus: A Population-Based Cohort Study

Table 2

Risk of NPDR and STDR in patients with type 2 diabetes after propensity score matching.

Metformin user events (total)Metformin nonuser events (total)Crude HR (95% CI)Adjusted HR (95% CI)

NPDR555/5022578/50220.65 (0.58–0.73)0.76 (0.68–0.87)
STDR43/502268/50220.39 (0.27–0.58)0.29 (0.19–0.45)
STDR among NPDR patients43/86014/1820.50 (0.27–0.92)0.54 (0.28–1.01)

NPDR patients were those who received any oral antidiabetic drugs after the diagnosis of NPDR among the study population. NPDR: nonproliferative diabetic retinopathy; STDR: sight-threatening diabetic retinopathy; HR: hazard ratio.