question archive 3) In 2006 two thousand women aged 50-60 years were examined for the presence of breast cancer, of those 2000 women 50 had detectable breast cancer in 2006
3) In 2006 two thousand women aged 50-60 years were examined for the presence of breast cancer, of those 2000 women 50 had detectable breast cancer in 2006
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3) In 2006 two thousand women aged 50-60 years were examined for the presence of breast cancer, of those 2000 women 50 had detectable breast cancer in 2006. Of those free from breast cancer in 2006 all were followed from Jan 1* 2007 through December 31, 2008. One hundred fifty women were lost to follow-up and 210 died of other causes (assume they were lost or died midway through the follow-up period). During follow-up 64 women developed breast cancer. Assuming all lost-to-follow-up or deaths occurred in the middle of the two-year study period. (2.5 points each; 10 points total) a. What is the prevalence of breast cancer in 2006 (expressed as per 1,000)? b. What is the cumulative incidence (CI) for breast cancer for 2007-2008 (expressed as per 1,000)? c. What is the incidence density (ID) for the two-year follow-up period (2007-2008) in the unit of the person-years? d. What is the incidence density (ID) per 1,000 person-months?
