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Two interventions: meta‐analysis
Interpreting confidence intervals
Always present estimate with a confidence interval
Precision
• point estimate is the best guess of the effect
• CI expresses uncertainty – range of values we can be reasonably sure
includes the true effect
Significance
• if the CI includes the null value
• rarely means evidence of no effect
• effect cannot be confirmed or refuted by the available evidence
• consider what level of change is clinically important
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