Patients with breast cancer sometimes die for other reasons. In a Nurses' Health study, women with breast cancer were followed for 10 years and 2.5% had incidence of heart disease. Suppose the baseline 10-year incidence rate of heart disease in the general population is 2%. Assume a study is to be undertaken tracking women with breast cancer to see if there is a difference in the heart disease rate from the general population. Assuming the true heart disease incidence rate for women with breast cancer is 2.5%, what is the power of this test if the investigators are able to track 6,000 women with breast cancer? Answer as a proportion carried to 3 digits beyond the decimal.