- OR, Odds ratio
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1 Certainty lowered for imprecision
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2 Certainty lowered for individual study risk of bias
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3 Certainty lowered two levels for imprecision
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4 Certainty lowered for indirectness
- GRADE Working Group grades of evidence – High quality: Further research is very unlikely to change our confidence in the estimate of effect; Moderate quality: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate; Low quality: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate; Very low quality: We are very uncertain about the estimate