Statistics – MCQ
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Question 1 of 5
1. Question
1. A psychiatrist devised a short screening test for depression. An independent blind comparison was made with a gold standard for diagnosis of depression among 200 psychiatric outpatients. Among the 50 outpatients found to be depressed according to the gold standard, 35 patients were positive for the test. Among 150 patients found not to be depressed according to the gold standard, 30 patients were found to be positive for the test. What is the test’s sensitivity?
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Question 2 of 5
2. Question
2. A psychiatrist devised a short screening test for depression. An independent blind comparison was made with a gold standard for diagnosis of depression among 200 psychiatric outpatients. Among the 50 outpatients found to be depressed according to the gold standard, 35 patients were positive for the test. Among 150 patients found not to be depressed according to the gold standard, 30 patients were found to be positive for the test. What is the test’s specificity?
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Question 3 of 5
3. Question
3. A psychiatrist devised a short screening test for depression. An independent blind comparison was made with a gold standard for diagnosis of depression among 200 psychiatric outpatients. Among the 50 outpatients found to be depressed according to the gold standard, 35 patients were positive for the test. Among 150 patients found not to be depressed according to the gold standard, 30 patients were found to be positive for the test. What is the test’s PPV?
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Question 4 of 5
4. Question
4. A psychiatrist devised a short screening test for depression. An independent blind comparison was made with a gold standard for diagnosis of depression among 200 psychiatric outpatients. Among the 50 outpatients found to be depressed according to the gold standard, 35 patients were positive for the test. Among 150 patients found not to be depressed according to the gold standard, 30 patients were found to be positive for the test. What is the test’s NPV?
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Question 5 of 5
5. Question
5. Now The GP is trying to implement the same test in his local setting. However, the prevalence has changed to 5%. Among 10 people with depression according to gold standard 7 tested positive with screening test. And among 190 persons without depression 152 tested negative respectively. What has happened to Sn, Sp, PPV and NPV of the test? When the prevalence of a disease decreases which of the following is true?
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