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Figure 1 Post-myocardial infarction (MI) patients were recruited and assigned to one of four categories based on the Beck Depression Inventory (BDI), ranging from no depressive symptoms (BDI <5) to moderate to severe depressive symptoms (BDI 
19). During the five-year follow-up period, a gradient relationship was observed between the magnitude of depressive symptoms and the frequency of deaths, with increased events occurring even in patients with mild depressive symptoms (BDI 5 to 9) (2).
