Table 3 Summary of statistical assessment of phiBiScan tool

True positive (TP)

False positive (FP)

True negative (TN)

False negative (FN)

Sensitivity $\left(\frac{\mathit{TP}}{\mathit{TP}+\mathit{FN}}\right)$

Specificity $\left(\frac{\mathit{TN}}{\mathit{FP}+\mathit{TN}}\right)$

PPV $\left(\frac{\mathit{TP}}{\mathit{TP}+\mathit{FP}}\right)$

NPV $\left(\frac{\mathit{TN}}{\mathit{TN}+\mathit{FN}}\right)$

Correlation coefficient $\left(\frac{\left(\mathit{TP}\ast \mathit{TN}\right)\left(\mathit{FP}\ast \mathit{FN}\right)}{\sqrt{\left(\mathit{TP}+\mathit{FP}\right)\left(\mathit{TP}+\mathit{FN}\right)\left(\mathit{TN}+\mathit{FP}\right)\left(\mathit{TN}+\mathit{FN}\right)}}\right)$