Question: A study was conducted to evaluate the benefits of an intensive exercise program in reducing subsequent mortality among persons who survive after an initial myocardial infarction. Patients were randomized to receive either usual care (controls) or the exercise program. Among 100 controls, 50 died within the three year follow-up period, compared with 30 deaths among the 100 patients on the exercise program.

What was the relative risk of death for the exercise group compared to controls?

1. 0.30
2. 0.60
3. 1.67
4. 3.33

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