A new non-invasive screening test is proposed that is claimed to be able to iden

Question

A new non-invasive screening test is proposed that is claimed to be able to identify patients with impaired glucose tolerance based on a battery of questions related to health behaviors. The new test is given to 75 patients. Based on each patient’s responses to the questions they are classified as positive or negative for impaired glucose tolerance. Each patient also submits a blood sample and their glucose tolerance status is determined. The results are tabulated below. Screening Test Impaired Glucose Tolerance Not Impaired Positive 20 18 Negative 5 32 What is the sensitivity of the screening test? 0.8000 0.6400 0.1351 0.5263

Explanation / Answer

The Correct answer is 0.8000

Positive 20 18

Negative 5 32

Sensitivity = (true positives) / ((true positives) + (false negatives))

= 20/(20+5) = 20/25 = 0.8

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