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The association between metformin and non-metformin and clinical outcomes in HbA1c ≥7% subgroup. Metformin was positively related to the all-cause mortality (P = 0.017) (A) but has no effect on cardiovascular death (P = 0.092) (B), all-cause hospitalizations (P = 0.671) (C), or hospitalization for heart failure (P = 0.304) (D).
