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Anepidemiologicstudyofbreastcanceramongelderlywomenfollowed1,400women,65-79yearsofage,withoutevidenceofbreastcanceroverseveralyears.Everytwoyearstheinvestigatorsexaminedthewomenforbreastcancer.Theresultswereasfollows:12newcasesatthefirstevaluation,11newcasesatthesecondevaluation,23newcasesatthethirdevaluation,and28newcasesatthefourth(final)evaluation.Theinvestigatorsalsonotedthat35ofthewomenhadwithdrawnfromthestudyatthethirdevaluation.Basedonthisinformation,calculateandinterprettheperson-timeincidencerateofbreastcancerinthisgroupandtheassociated95%confidenceinterval
Anepidemiologicstudyofbreastcanceramongelderlywomenfollowed1,400women,65-79yearsofage,withoutevidenceofbreastcanceroverseveralyears.Everytwoyearstheinvestigatorsexaminedthewomenforbreastcancer.Theresultswereasfollows:12newcasesatthefirstevaluation,11newcasesatthesecondevaluation,23newcasesatthethirdevaluation,and28newcasesatthefourth(final)evaluation.Theinvestigatorsalsonotedthat35ofthewomenhadwithdrawnfromthestudyatthethirdevaluation.Basedonthisinformation,calculateandinterprettheperson-timeincidencerateofbreastcancerinthisgroupandtheassociated95%confidenceinterval
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Larson Algebra 1 California
Authors: Ron Larson, Laurie Boswell, Timothy D. Kanold, Lee Stiff
1st Edition
