Table 4

Diagnostic performance of a low COVID-19 risk threshold (less than four points on the diagnostic score) and high-risk threshold (greater than nine points)

Prevalence
Low-risk diagnostic score threshold (<4)Study population0.50.20.10.050.01
Sensitivity26.6%
Specificity96.6%
PPV89.0%88.7%66.2%46.6%29.2%7.3%
NPV56.0%56.8%84.0%92.2%96.2%99.2%
High-risk diagnostic score threshold (>9)
 Sensitivity37.0%
 Specificity96.1%
 PPV90.1%90.4%70.1%51.0%33.0%8.6%
 NPV61.2%60.4%85.9%93.2%96.7%99.3%
  • Low-risk threshold diagnostic accuracy is for identifying patients without COVID-19, whereas high-risk threshold is for identifying patients with COVID-19.

  • NPV, negative predictive value; PPV, positive predictive value.