Asked by Jeannyn Salinas on Jul 31, 2024
Verified
A physical examination,digital rectal exam,was used to screen for prostate cancer in 290 men with biopsy-proven prostate cancer and in 516 age- and race-matched control men,all of whom showed no evidence of cancer at biopsy.The results of the physical examination were positive in 136 cases and in 165 control men.What is the specificity of the physical examination?
A) 32%
B) 47%
C) 53%
D) 68%
E) Cannot calculate it based on given information
Digital Rectal Exam
A manual examination performed by inserting a lubricated, gloved finger into the rectum to check for abnormalities of organs or other structures in the pelvis and lower belly.
Specificity
In diagnostic testing, the ability of the test to correctly identify those without the disease.
- Understand the concept and calculation of specificity in screening tests.
Verified Answer
CN
Chizoba NnakweAug 07, 2024
Final Answer :
D
Explanation :
Specificity equals the "number of people who were identified as nondiseased by the test" divided by the "number of people who actually do not have the disease." The specificity is 0.68 (351 divided by 516).
Learning Objectives
- Understand the concept and calculation of specificity in screening tests.
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