Table 3 Results of blinded investigator-based diagnosis using POCUS compared to patient diagnosis

Diagnosis by neuroimaging (head CT or MRI)

Condition positive (ICH present)

6 ICH

1 SAH with ICH

Condition negative (No ICH present)

4

POCUS result outcome

Positive (ICH present)

True Positive

7

False Positive

2

Positive predictive value

77%

 = TP/(TP + FP)

Negative (ICH not present)

False Negative

0

True Negative

2

Negative Predictive value

100%

 = TN(FN + TN)

Sensitivity

100%

 = TP/ (TP + FN)

Specificity 50%

 = TN/(FP + TN)