cise 4: (1 point)he e of a uIosv Investigators conducted a study to evaluate the

Question

cise 4: (1 point)he e of a uIosv Investigators conducted a study to evaluate the use of a mammogram screening test in finding breast cancer. 100,000 women had a mammogram. There were 90 women with a positive mammogram who had breast cancer. Of 99,900 women without breast cancer 94,905 women had a normal mammography with no breast cancer. Please complete the 2 x 2 table below. What was the sensitivity, specificity, positive predictive value and negative predictive value of the test? Interpret the results (e.g. what does the specificity value in this example mean?). Is this a valid screening test? (Show your work) Test Total Breast Cancer No Breast Cancer Positive Negative Total 99,900 100,000 Sensitivity Specificity PPV NPV

Explanation / Answer

(first part) following 2x2 table is completed

(second part)

sensitivity=TP/(TP+FN)=90/(90+10)=0.9

specificity=TN/(TN+FP)=94905/(94905+4995)=0.95

PPV=TP/(TP+FP)=90/(90+4995)=0.0177

NPV=TN/(TN+FN)=94905/(94905+10)=0.9999

following information has been generated from the given question

Test Breast Cancer No Breast Canccer Total Positive 90 4995 5085 Negative 10 94905 94915 Total 100 99900 100,000

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