Fig. 7

a Funnel plot of hazard ratio of cardiovascular mortality among patients with metformin therapy vs no-metformin therapy. b Funnel plot of hazard ratio of all-cause mortality among patients metformin therapy vs no-metformin therapy. c Funnel plot of hazard ratio of CV events among patients with metformin therapy vs no-metformin therapy. d Funnel plot of hazard ratio of CV events among patients with T2DM at baseline, metformin therapy vs no-metformin therapy