clar697
Forum Guru
Topics: 190
Posts: 199
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Culture
Positive Negative
Test Positive 100 10 110
Negative 20 1870 1890
120 1880 2000
The performance of a new nonculture test for infectious disease X is evaluated by comparing its performance to that if a perfectly accurate culture in an unselected population of 2000 individuals. The results of this evaluation are shown. Which of the following is the specificity of this new test relative to that of culture?
A) 66.7%
B) 83.3%
C) 90.9%
D) 94.9%
E) 99.5%
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| yousefreda
Forum Junior
Topics: 7
Posts: 80
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spec = TN/TN +FP
= 1870/1870 + 10
= E
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