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Table 3 GRADE categories of the quality of evidence

From: Methodological challenges in appraising evidence on diagnostic testing for WHO guidelines on hepatitis B and hepatitis C virus infection

Level of evidence Rationale
High Further research is very unlikely to change our confidence in the estimate of effect.
Moderate Further research is likely to have an important impact on our confidence in the effect.
Low Further research is very likely to have an estimate of effect and is likely to change the estimate.
Very low Any estimate of effect is very uncertain.
  1. World Health Organization Guidelines on Hepatitis B and C Testing, 2017, Table 3.1 [3]