Statistical analysis plan for the feasibility trial assessing external trigeminal nerve stimulation versus sham stimulation for ADHD in children and adolescents aged 7 to 17 years (the eTNS4ADHD trial)
This paper outlines the prespecified statistical analysis plan for the eTNS4ADHD feasibility trial, a multicentre randomised pilot study designed to evaluate the recruitment, compliance, and acceptability of active versus sham external trigeminal nerve stimulation in children and adolescents with ADHD to inform the design of a future definitive clinical trial.
Original paper dedicated to the public domain under CC0 1.0 (https://creativecommons.org/publicdomain/zero/1.0/). This is an AI-generated explanation of a preprint that has not been peer-reviewed. It is not medical advice. Do not make health decisions based on this content. Read full disclaimer
Attention-deficit/hyperactivity disorder, or ADHD, is a common condition in children and adolescents that affects how they focus, control impulses, and manage their energy levels. For many families, finding a treatment that works without relying on medication is a primary goal. One non-drug approach that has recently gained attention is a device that delivers mild electrical stimulation to a specific nerve in the face, known as the trigeminal nerve. This nerve connects to areas of the brain that regulate attention and behavior. While early studies suggest this method might help, scientists need to be certain that a large, definitive study can actually be run before they can say for sure if the treatment works. The question is not just whether the device helps, but whether it is practical to test it properly on a large scale.
A team of researchers in Denmark has published a detailed plan for how they will test this very question. Their work, called the eTNS4ADHD trial, is not yet a final verdict on whether the treatment cures ADHD. Instead, it is a feasibility study, a type of research designed to see if a larger, more expensive experiment is possible and sensible. The researchers are preparing to recruit children and teenagers between the ages of seven and seventeen who have been diagnosed with ADHD. These participants will be randomly assigned to one of two groups: one group will receive the actual nerve stimulation, while the other will receive a fake version, known as a sham, where the device looks and feels the same but does not deliver the active treatment. This setup allows the team to compare the two groups fairly, ensuring that any differences they see are likely due to the treatment itself rather than other factors.
The core of this paper is a statistical analysis plan, which is essentially a rulebook written before the study begins. This document outlines exactly how the researchers will measure success and handle the data, ensuring that their conclusions are honest and transparent. The primary goal is to check the logistics of the study. They want to know if they can find enough willing families, if the children will stick with the treatment for the full four weeks, and if the families will complete all the necessary follow-up surveys. The plan sets specific targets for these logistical hurdles. For instance, they hope that more than half of the eligible families will agree to join the study, that at least seventy percent of the participants will use the device for the required amount of time each night, and that ninety percent of the group will finish the final assessments. If the study meets these targets, it will be considered a success in terms of feasibility, paving the way for a much larger trial.
Beyond the logistics, the researchers will also look at how the children are doing, but they are very careful about how they interpret these results. They will track symptoms like inattention and hyperactivity, as well as emotional stability, sleep quality, and time missed from school. Because this is a small pilot study, it is not designed to prove that the treatment works. The numbers involved are too small to provide a definitive answer. Instead, any improvements seen in the children will be treated as clues or hints that could guide the design of the future, larger study. The researchers have built safeguards into their plan to prevent bias. Two statisticians, who do not know which children received the real treatment and which received the fake one, will analyze the data independently. They will compare their findings and resolve any disagreements before anyone is told which group was which. This ensures that the final report is based on the data, not on what the researchers hope to find.
The plan also details how they will handle the data they collect, from the daily logs of device usage to the reports of any side effects. They will not try to guess or fill in missing information, but rather report exactly what is missing so that future studies can learn from it. If the study shows that the treatment is safe, that families are willing to try it, and that the children can stick with the routine, then the researchers will have the green light to move forward. The ultimate aim is to determine if external trigeminal nerve stimulation can become a reliable, non-drug option for children struggling with ADHD, but first, they must prove that the path to finding that answer is clear and walkable.
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