Consider data which shows the overall results from a cohort study of race and survival from prostate cancer.What measure should the investigator use to best describe the level of the outcome (survival) among a certain race in the studyattributable to the effects of that race?

a.

Number Needed to Treat

b.

Cumulative Incidence

c.

Population Attributable Risk

d.

Risk Ratio

e.

Attributable Risk