Exercises: A. The following table shows the results obtained in a screening test
ID: 3044544 • Letter: E
Question
Exercises: A. The following table shows the results obtained in a screening test for diabetes used on 10,000 persons. The cutoff level was a blood glucose value of 180 mg/dl or above as positive for diabetes.
Results of screening test for Diabetes
Test Results
Positive
Negative
Total
Positive
34
20
54
Negative
116
9,830
9,946
Total
150
9,850
10,000
Compute the fractions representing sensitivity
a) Sensitivity = 34/150 or 22.7%
b) Sensitivity = 9,830/9,850 or 99.8%
c) Sensitivity = 34/54 or 63.0%
d) Sensitivity = 9,830/9,946 or 98.8%
My answer is A
Test Results
Positive
Negative
Total
Positive
34
20
54
Negative
116
9,830
9,946
Total
150
9,850
10,000
Explanation / Answer
Actual number of people diagnosed with diabetes = 34 + 116 = 150
Number of people tested positive by screening test = 34
Sensitivity = Proportion of true positives = 34 / 150 = 22.7%
Answer: Option A
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