The table below shows results obtained in a new screening test for diabetes. 10,000 people were screened. The cut-off level employed was 180mg of blood glucose per 100 ml. Everyone scoring above this level was classified as positive for diabetes. Everyone scoring below this level was classified as negative for diabetes. These results were compared to a “gold standard” diagnostic test for diabetes that is considered to be completely valid. Data of screening test and gold standard results "Gold-Standard" Test
The table below shows results obtained in a new screening test for diabetes. 10,000 people were screened. The cut-off level employed was 180mg of blood glucose per 100 ml. Everyone scoring above this level was classified as positive for diabetes. Everyone scoring below this level was classified as negative for diabetes. These results were compared to a “gold standard” diagnostic test for diabetes that is considered to be completely valid.
Data of screening test and gold standard results
|
|
"Gold-Standard" Test |
|
|
|---|---|---|---|
|
Screening Test |
Disease |
No Disease |
Total |
|
Positive |
125 |
25 |
150 |
|
Negative |
375 |
9475 |
9820 |
|
Total |
500 |
9500 |
10000 |
Calculate the positive predictive and specificity value and express it as a percent rounded to one decimal place.
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