A study is conducted to investigate the incidence of second myocardial infarction (MI). After having the first MI, 40 subjects are followed. With the exception of three patients, all subjects were observed for 10 years. The three exceptions contributed 1.5, 5.3, and 7.5 years. What are the total person-years in the study? If there were 3 events during this study, what is the event rate?

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The Answer of A study is conducted to investigate the incidence of second myocardial infarction (MI). After having the first MI, 40 subjects are followed. With the exception of three patients, all subjects were observed for 10 years. The three exceptions contributed 1.5, 5.3, and 7.5 years. What are the total person-years in the study? If there were 3 events during this study, what is the event rate?

A Study Is Conducted to Investigate the Incidence of Second