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Table 2 Modifier

From: EVITA: a tool for the early EValuation of pharmaceutical Innovations with regard to Therapeutic Advantage

NNT ARR Modifier
prevention   
<20 5-100% 2.0
20 - <50 <5% 1.75
50 - <100 <2% 1.5
100 - <175 <1% 1.25
175 - <300 <0.57% 1.0
300 - <500 <0.33% 0.75
500 - <1000 <0.2% 0.5
≥1000 <0.1% 0.25
treatment   
NNT ARR Modifier
<3 >30% 2.0
3 - <10 10-30% 1.5
≥10 <10% 1.0
  1. Assessment of the modifier for the efficiency score according to strength of effect given in "number needed to treat" (NNT) or "absolute risk reduction" (ARR).