Table 5.

Sensitivity, specificity, and positive and negative predictive values, accuracy ratio and likelihood ratios according to BSTI and RSNA criteria

	Sensitivity	Specificity	PPV*	NPV*	Accuracy*	LR+	p value
RSNA-typical COVID-19
Observer A	81.2%	89.7%	88.7%	82.7%	85.4%	7.9	< 0.001
Observer B	81.0%	90.4%	89.2%	82.6%	85.6%	8.4	< 0.001
BSTI-classic COVID-19
Observer A	63.7%	95.5%	93.5%	72.5%	79.6%	14.1	< 0.001
Observer B	64.2%	95.5%	93.6%	72.8%	79.9%	14.3	< 0.001
BSTI-classic and probable COVID-19
Observer A	83.3%	89.7%	89.0%	84.3%	86.5%	8.1	< 0.001
Observer B	82.5%	90.0%	89.2%	83.7%	86.3%	8.2	< 0.001

PPV positive predictive value, NPV negative predictive value

*Reverse transcription polymerase chain reaction positive and negative patient numbers were equalized while calculating PPV, NPV and accuracy ratio

⁺Likelihood ratios