Of note, the rate of nonpreventable ADEs was actually
higher in the intervention group. Besides chance
or confounding, possible reasons for this include a
higher rate of reporting due to increased knowledge
of potential side effects in the intervention group, or
an actual increase in the prevalence of these side
effects due to the power of suggestion (a variation of
the “nocebo” effect30,31). Misclassification of preventable
and nonpreventable ADEs is also a possibility,
although our use of blinded, independent adjudicators
makes this less likely.