Homework Answers
In a normal screening program, the term detection rate is equivalent to;
Sensitivity (As only if the procedure is sensitive it will pick the positive cases correctly, as for example in breast cancer screening mammography)
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Question 3 (1 point) In a normal screening program, the term detection rate is equivalent to:...
Which cell in the table represents false positives? Fourfold Table for Classification of Screening Test Results...
Which cell in the table represents false positives? Fourfold Table for Classification of Screening Test Results Present Absent Total Positive a+b Predictive Value (+) = a/(a+b) Predictive Value () =d/(c+d) Test Result Negative cid Total b+d Grand total = a+b+c+d Sensitivity a/(a+C) Specificity - d/(b+d) СА, а Bb D.d QUESTION 5 The lowest dose at which a particular response occurs is known as the a. Threshold b. Mode c. Epidemic curve d. None of the above
***PLEASE label what answer is for what question as clear as possible**** (Yes this is ONE...
***PLEASE label what answer is for what question as clear as possible**** (Yes this is ONE question) Suppose that 50,000 women who have never had a breast cancer diagnosis are available and willing to participate in a new screening program of computerized digital mammography. At the first screen, 1132 women were positive on the screening test. All of these positive women had a breast biopsy and 136 were diagnosed with breast cancer. Of the 48,868 who screened “negative” on the...
Question 6 (1 point) A large difference between two results of the same analyte from a...
Question 6 (1 point) A large difference between two results of the same analyte from a single hospital patient was obtained on the same day and flagged on a chemistry analyzer result form. If the controls within acceptable limits, what analysis should be performed on the results? were a) Reference change value test b) Delta check c) Intra individual variability test d) Critical difference test Question 7 (1 point) Prevalence affects which of the following test characteristic? a) False Positive...
2. Two simple and inexpensive screening methods have been developed to identify individuals with HIV infection...
2. Two simple and inexpensive screening methods have been developed to identify individuals with HIV infection at routine medical check-ups. To study the sensitivity and specificity, both methods were tested on 12860 persons who underwent a simultaneous and thorough clinical examination that was considered to give an accurate diagnosis. There were 1900 cases of disease as diagnosed by clinical methods. The Screening test #1 was positive for a total of 1000 people, including 800 with active HIV infection. The screening...
Epidemiology question 3. ng the screening cut-off point affect sensitivity. specificity, PPV and NPV of the...
Epidemiology question
3. ng the screening cut-off point affect sensitivity. specificity, PPV and NPV of the test? Why? are the respective "costs" ring the screening cut-off point affect the number of false positives and false negatives associated with false positives and false negativesi ? What 5. sensitivity, PPV and NPV of the test? How would you expect raising the cut-off point to 220mg of blood glucose per 100ml to affect the specificity was repeated using the 130mg of blood glucose...
Medical screening tests are used to check for the presence on disease, evidence of illegal drug...
Medical screening tests are used to check for the presence on disease, evidence of illegal drug use, etc. The its sensitivity and its specificity. The sensitivity among those with the condition that will test positive. The specichy proportion among those without the condition that will test neg sensitivity of a test is defined to be the conditional ng those without the condition that will test negative. More formally, the test is defined to be the conditional probability that a person...
Chapter 1-Meulth and Disease 15 9. The number of new cases per year is the C...
Chapter 1-Meulth and Disease 15 9. The number of new cases per year is the C specificity is to true negative. D. predictive value is to false negative. 14. What roles do our environment and our genetics C Occurrence D. Mortality rate play in causing disease? Consider examples along the continuum. 15. Compare and contrast clinical and anatomic 10. Heart disease is which of the following? pathology A. B. Polygenic Environment 16. In screening a population for a lethal disease,...
Question 27 0 out of 2p A new screening test for Lyme disease is developed for...
Question 27 0 out of 2p A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new test are 65% and 75%, respectively. Four hundred people are screened at a clinic during the first year the new test is implemented. Assume the true prevalence of Lyme disease among clinic attendees is 15%. Calculate the predictive value of a negative test.
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point) 12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B?...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Disea...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point) 12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B?...
Which cell in the table represents false positives? Fourfold Table for Classification of Screening Test Results Present Absent Total Positive a+b Predictive Value (+) = a/(a+b) Predictive Value () =d/(c+d) Test Result Negative cid Total b+d Grand total = a+b+c+d Sensitivity a/(a+C) Specificity - d/(b+d) СА, а Bb D.d QUESTION 5 The lowest dose at which a particular response occurs is known as the a. Threshold b. Mode c. Epidemic curve d. None of the above
Question 6 (1 point) A large difference between two results of the same analyte from a single hospital patient was obtained on the same day and flagged on a chemistry analyzer result form. If the controls within acceptable limits, what analysis should be performed on the results? were a) Reference change value test b) Delta check c) Intra individual variability test d) Critical difference test Question 7 (1 point) Prevalence affects which of the following test characteristic? a) False Positive...
Epidemiology question
3. ng the screening cut-off point affect sensitivity. specificity, PPV and NPV of the test? Why? are the respective "costs" ring the screening cut-off point affect the number of false positives and false negatives associated with false positives and false negativesi ? What 5. sensitivity, PPV and NPV of the test? How would you expect raising the cut-off point to 220mg of blood glucose per 100ml to affect the specificity was repeated using the 130mg of blood glucose...
Medical screening tests are used to check for the presence on disease, evidence of illegal drug use, etc. The its sensitivity and its specificity. The sensitivity among those with the condition that will test positive. The specichy proportion among those without the condition that will test neg sensitivity of a test is defined to be the conditional ng those without the condition that will test negative. More formally, the test is defined to be the conditional probability that a person...
Chapter 1-Meulth and Disease 15 9. The number of new cases per year is the C specificity is to true negative. D. predictive value is to false negative. 14. What roles do our environment and our genetics C Occurrence D. Mortality rate play in causing disease? Consider examples along the continuum. 15. Compare and contrast clinical and anatomic 10. Heart disease is which of the following? pathology A. B. Polygenic Environment 16. In screening a population for a lethal disease,...
Question 27 0 out of 2p A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new test are 65% and 75%, respectively. Four hundred people are screened at a clinic during the first year the new test is implemented. Assume the true prevalence of Lyme disease among clinic attendees is 15%. Calculate the predictive value of a negative test.
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point) 12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B?...
10) Please calculate the Sensitivity and Specificity from the 2 by 2 (Screening Test A). (2 points) Test + Test- Diseased 100 10 Not Diseased 20 80 Sensitivity Specificity How many false positives are there? (1 point) 12) Please Calculate the Sensitivity and Specificity of Screening Test B (2 points) Not D Test Positive 34 Test Negative 13 If I wanted to limit the number of false positives, which of the two screening tests would be preferred? A or B?...
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