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Table 5 Sensitivity, specificity, and positive and negative predictive values, accuracy ratio and likelihood ratios according to BSTI and RSNA criteria

From: RSNA and BSTI grading systems of COVID-19 pneumonia: comparison of the diagnostic performance and interobserver agreement

 

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

  1. PPV positive predictive value, NPV negative predictive value
  2. *Reverse transcription polymerase chain reaction positive and negative patient numbers were equalized while calculating PPV, NPV and accuracy ratio
  3. +Likelihood ratios