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Kaplan-Meier estimated survival probability curve for patients with hemoglobin A1c levels ≥7.0% according to the antidiabetic treatment (metformin use or metformin nonuse). The median survival time was 273 days (95% confidence interval [CI], 128.2 to 359.8) in the metformin use group and 145 days (95% CI, 39.5 to 256.3) in the metformin nonuse group (p=0.058).
