Soru

A medical researcher is evaluating the relationship between the class of oral antidiabetic medication prescribed and the incidence of major adverse cardiovascular events (MACE) in a retrospective cohort of 1,250 patients with type 2 diabetes. The medication classes are categorized as SGLT2 inhibitors ($n = 450$), GLP-1 receptor agonists ($n = 600$), and DPP-4 inhibitors ($n = 200$). The cardiovascular outcomes over the study period are classified into three mutually exclusive categories: myocardial infarction ($n = 150$), ischemic stroke ($n = 100$), and no MACE ($n = 1,000$).

The researcher plans to use a Pearson chi-square test to determine if the choice of medication is independent of cardiovascular outcomes. A key assumption of this test is that no more than 20% of the expected cell frequencies are less than 5.

Under the null hypothesis of no association, what is the expected count of patients who were prescribed a GLP-1 receptor agonist and subsequently experienced a myocardial infarction? (Enter your answer as a whole number).