Specificity calculation for a new diagnostic test

A new diagnostic test for Condition Z is evaluated in a prospective study of 500 patients. Of 100 patients with Condition Z, 80 test positive and 20 test negative; of 400 patients without Condition Z, 380 test negative and 20 test positive. Which of the following values best represents this test's specificity?

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Specificity calculation for a new diagnostic test | QWorld.Ai