Confidence Intervals: Linking Evidence to Practice

Abstract

Two previous Evidence in Practice articles described the shift in clinical research toward using between-group differences as the measure of treatment effectiveness. One key advantage to reporting the between-group difference (the effect estimate), as opposed to only providing a P value from a hypothesis test, is that it tells the reader about the size of the effect. Confidence intervals give the reader critical information about the precision of an effect estimate reported in a trial. Integrating information about the likely effect and its precision, along with understanding the concept of clinical meaningfulness, helps the clinician engage patients in an informed, shared decision-making process. J Orthop Sports Phys Ther 2019;49(10):763–764. doi:10.2519/jospt.2019.0706

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