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L 5,6 , Screening test , Community

 L 5,6 , Screening test , Community


Lecture video 


MCQ


1\ specificity is the ability of the screening test to measure:

A/ false positive cases

B/ true positive cases

 C/ true negative cases

D/ false negative cases

2/ Reliability can be defined as:

A/ The degree to which an instrument measures what it is supposed to measure

B/ The degree to which results are consistent on a repeat measurement

C/ A measure of the degree or strength of association between two variables.

D/ Concerned with measuring the frequency of new cases with reliability

3/ It is the ability of the test to give positive results with true cases

A/ Sensitivity

B/ Specificity

C/ Positive predictive value

D/ Negative predictive value

4/ It is the ability of the test to give negative results with truly free individuals

A/ Sensitivity

B/ Specificity

C/ Positive predictive value

D/ Negative predictive value

5/ It is the probability of a disease in a person who receives a positive test result

A/ Sensitivity

B/ Specificity

C/ Positive predictive value

D/ Negative predictive value

6/ It is the probability of freedom from disease in a person who receives a negative test result.

A. Sensitivity


B. Specificity


C. Positive predictive value


D. Negative predictive value


Calculate


1. In an experiment to measure the accuracy of a new screening test, the test was positive in 65 out of 70 diseased patients while it was negative in 20 out of 30 disease free subjects. Calculate the sensitivity and specificity of that screening test.



2. A total of 1200 patients known to have a disease were tested using a new diagnostic test and 800 patients test positive. Furthermore, 1200 patients without the disease were tested and 900 return a negative result. Calculate the sensitivity, specificity, PPV and NPV?

Answers


MCQ


C/1
B/2
A/3
B/4
C/5
D/6

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