What is the percentage of agreement between the two tests


Problem

As a researcher, you are comparing tuberculin skin test (TST) and a whole-blood interferon gamma assay for the diagnosis latent tuberculosis infection (LTBI) among 10,000 study participants and come up with the results showed in the table below. What is the percentage of agreement between the 2 tests?

 

Tuberculin Skin Test

Total

 

+

-


INTERFERON GAMMA +

270

97

367

INTERFERON GAMMA -

30

9603

9633

Total

300

9,700

10,000

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