Economic evaluation alongside n-of-1 trials: getting closer to the margin.

The n-of-1 trial is a particularly flexible form of randomized controlled trial that involves a single patient receiving multiple episodes of alternative therapies. Although n-of-1 trials are only applicable in certain treatment areas, the collection of economic data within such trials may provide unique advantages. This paper illustrates the issues around the use of economic n-of-1 trials with a hypothetical example, and discusses their potential for the estimation of individualized cost-effectiveness.