Estimate the 2-year risk, and give a 95% confidence interval for this estimate?

Cardiovascular Disease

Treatment with statins can reduce the risk of a major cardiovascular event in people with specified risk factors. During about 2 years of follow-up in the JUPITER trial (P. M. Ridker et al. [8]) , 142 of 8901 subjects treated with a statin had a major cardiovascular event.