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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