Regression standardized test specificity by month to expiration, adjusting for site, lot, and technician.

<p>The blue squares in the figure represent the mean adjusted specificity of the tests, and the black ovals represent the limits of the 95% bootstrap confidence interval.</p

Multivariable logistic model for false positive test results.

<p>Multivariable logistic model for false positive test results.</p

Test specificity by time to expiration.

<p>Test specificity by time to expiration.</p