An interactive sample size calculator for micro-randomized trials
There is a growing interest in leveraging the prevalence of mobile technology to improve health by delivering momentary, contextualized interventions to individuals' smartphones. A just-in-time adaptive intervention (JITAI) adjusts to an individual's …
BACKGROUND: HeartSteps is an mHealth intervention that encourages regular walking via activity suggestions tailored to the individuals' current context. PURPOSE: We conducted a micro-randomized trial (MRT) to evaluate the efficacy of HeartSteps’ …
The micro-randomized trial (MRT) is a new experimental design which allows for the investigation of the proximal effects of a ``just-in-time'' treatment, often provided via a mobile device as part of a mobile health intervention. As with a …