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Table 2 Commonly used ADR measures and thresholds

From: Privacy preserving data anonymization of spontaneous ADE reporting system dataset

Measure Formula Threshold
PRR \( \frac{a/\left(a+b\right)}{c/\left(c+d\right)} \) PRR − 1.96 × SD > 1
PRR ≥ 2, a ≥ 3, χ 2 ≥ 4
ROR \( \frac{a/c}{b/d} \) ROR − 1.96 × SD > 1
IC \( { \log}_2\frac{a\left(a+b+c+d\right)}{\left(a+b\right)\left(a+c\right)} \) Expect(IC) − 1.96 × SD > 0