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Table 1 A Guide to Terminology

From: A system for rating the stability and strength of medical evidence

Major components of evidence
Term Definition
Quality The extent to which studies are protected from bias
Quantity The number of studies and the number of patients
Consistency The extent to which different studies found similar results
Robustness The extent to which minor alterations in the data do not change conclusions drawn from that data
Magnitude of effect The effect size
Quantitative and qualitative conclusions
Type of conclusion: Quantitative Qualitative
Clinical interpretation: How well does it work? Does it work?
Type of rating: Stability Strength
Interpretation of rating: Confidence that future evidence will not indicate a different effect size Confidence that future evidence will not indicate a different direction of effect
Possible ratings: High, Moderate, Low, or Unstable Strong, Moderate, Weak, or Inconclusive