In the US Nurses' Health Study (NHS) cohort study, where they looked at association of regular aspirin use (two 325 mg tablets/week) and colorectal cancer in 82,911 women found (RR, 0.77; 95% CI, 0.67-0.88) over
20 years of follow-up.
In an another analysis of the NHS, regular aspirin use, investigator also found (hazard ratio [HR]=0.72, 95% CI 0.56-0.92), what does this say about the mortality from colorectal cancer? How can this data best be interpreted?