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Table 1 Formulas for calculated metrics. FN False-negative, FP False-positive, NPV Negative predictive value, PPV Positive predictive value, SEN Sensitivity, SPE Specificity, TN True-negative, TP True-positive

From: Abstract screening using the automated tool Rayyan: results of effectiveness in three diagnostic test accuracy systematic reviews

TP = Number of eligible records (for objective 1) or eligible reports (for objective 2) identified by Rayyan eligible

TN = Number of ineligible records (for objective 1) or einligible reports (for objective 2) identified by Rayyan ineligible

FP = Number of ineligible records (for objective 1) or ineligible reports (for objective 2) identified by Rayyan as eligible

FN = Number of eligible records (for objective 1) or eligible reports (for objective 2) identified by Rayyan as ineligible

\(SEN=\frac{TP}{TP+ FN}\)

\(SPE=\frac{TN}{TN+ FP}\)

\(PPV=\frac{TP}{TP+ FP}\)

\(NPV=\frac{TN}{TN+ FN}\)

\(F1\ score=\frac{2 TP}{2 TP+ FP+ FN}\)