rhe next two questions refer to the following information screening examination
ID: 121511 • Letter: R
Question
rhe next two questions refer to the following information screening examination was performed on 250 persons for Factor X, which is found in definitive diagnosis for disease Y among the 250 persons had been obtained previously disease Y. A diagnoses are charted here: Test Results Disease Present 40 Positive for Factor X Disease Absent 60 140 Negative for Factor X 14. Based on the information provided, which of the following expresses the sensitivity of this test? A) 30% B) 70% C) 56% D) 80% 15. Based on the information provided, which of the following expresses the specificity of this test? A) 30% B) 70% C) 56% D) 7% 16. Which of the following is an example of "simple" health policy questions that pertain to the use of screening tests? [A] Who should be screened? Bj What conditions should be screened? [C] At what age should screening begin? [D] All of these are correct. 17. The ability of a screening test to identify correctly all screened individuals who actually have the disease refers to the test's: [A] sensitivity B] specificity [C] predictive value( ID] predictive value (+) 18. The ability of a test to identify only nondiseased individuals who actually do not have the disease refers to the test's: [A] sensitivity. B] specificity [C] predictive value (). [D] predictive value (+). 19. The ability of a measuring instrument to give consistent results in repeated trials is kmown as the instrument's: [A] reliability. B] predictivity [C] specificity D] sensitivityExplanation / Answer
As per norms I should answer for first question only
14) Sensitivity of this test = ((Number of persons affected by disease with positive factor of X) / (Total number of people affected by disease)) * 100
= (40/(40+10)) * 100 = 80 %
15) Specificity of this test = (( Number of persons with negative factor of X & without disease) / (Total number of people not affected by disease)) * 100
= (140/(140+60)) * 100 = 70 %
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