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Table 2 Summary of performance measures and formulas

From: Development and evaluation of a search filter to identify prognostic factor studies in Ovid MEDLINE

Performance measure

Formula

Sensitivity

(A/(A + C)) × 100

Specificity

(D/(B + D)) × 100

Precision

(A/(A + B)) × 100

Number needed to read (NNR)

(1/precision) × 100

Time saved

((C + D)/(A + B + C + D)) × 100