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Week 8: Data Interpretation and Confounding Exercise

Exercise on data interpretation and confounding variables.

Daniel Mitchell
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1Week 8: Data Interpretation and Confounding ExerciseTable 1 below describes data from a prospective cohort study examining the association betweentype of work schedule and the risk of prostate cancer in men.Table 1: Incidence of prostate cancer in14,052 male workers according to type of work scheduleWork scheduleDaytimeFixed nightRotating shiftNo. of subjects with no diagnosisof prostate cancer at the time ofenrollment in the study11,2699821,801No. ofperson-years of follow-up89,1798,27214,523No. of new prostate cancer cases2137Express your answers as per 10,000 person-years of follow-up where appropriate.A. What is the incidence density of prostate cancer in all participants in thestudy? (2 points)Shift the rows and columns of the above table and calculated the required ratios.The incidence density of prostate cancer in all participants in the study is in the below table.Work scheduleNo. ofsubjectswith nodiagnosisof prostatecancer atthe time ofenrollmentin thestudyIncidencedensityNo. ofperson-yearsoffollow-upIncidencedensityNo. ofnewprostatecancercasesIncidencedensityTotalDay time11,2690.11289,1790.888210.00021100,469Fixed night9820.1068,2720.89430.000329,257Rotating shift1,8010.11014,5230.88970.0004316,331B. What is the incidence density of prostate cancer in daytime workers? (2 points)The incidence density of prostate cancer in daytime workers is 0.00021

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