GSTM1 and myocardial infarction: In CHOIR [60], the lower Hb target (11.3 g/dL) was associated with a significantly higher incidence of myocardial infarction reported as an adverse event than the higher Hb target (13.5 g/dL) (10 patients [1.5%] vs 19 patients [3%], P = 0.05).