High: Image clinpretermfu1.jpgHigh confidence that the evidence reflects the true effect. Further research is very unlikely to change our confidence in the estimate of effect.
Moderate: Image clinpretermfu2.jpgModerate confidence that the evidence reflects the true effect. Further research may change our confidence in the estimate of effect and may change the estimate.
Low: Image clinpretermfu3.jpgLow confidence that the evidence reflects the true effect. Further research is likely to change our confidence in the estimate of effect and is likely to change the estimate.
Insufficient: Image clinpretermfu4.jpgEvidence is either unavailable or does not permit a conclusion.

From: Progestogens for Prevention of Preterm Birth

Cover of Comparative Effectiveness Review Summary Guides for Clinicians
Comparative Effectiveness Review Summary Guides for Clinicians [Internet].

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