Question

You work at a screening center that can process 1,000 people per week. Assume you are attempting the early detection of a disease with a prevalence of 2% and that your test has a sensitivity of 95% and a specificity of 90%. Key facts: - 1,000 tests per week - Early detection - 2% prevalence - 95% sensitivity - 90% specificity 13.

Complete the following 2 x 2 table (4 points):

Gold Standard Present Absent Total Test result Positive a = (True positives) b = (False Positives) (a + b) = + Predictive Value Negative c = (False Negatives) d = (True Negatives) (c + d ) = Total (a + c) = (b + d) = Grand Total (a + b + c + d)

Answer 1