Factors explaining the heterogeneity of effects of patient decision aids on knowledge of outcome probabilities: a systematic review sub-analysis.

For the third covariate, control event rate, the negatively sloped relationship is highly significant ( P = 0.001) and is slightly steeper after correcting for dependence of the effect measure on the control event rate, increasing confidence in true effect modification.

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While decision aid quality, as measured by the IPDASi probabilities dimension, may increase the effects of decision aids, this finding is of borderline significance and requires further analysis with data from additional studies.

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