Engaging Stakeholders in Building Patient-Centered, N-of-1 Randomized and Other Controlled Trial Methods [Methods Study], New York, 2014-2019

Medical studies usually focus on learning how a treatment works for most people. These studies have strict rules about who can take part. Patients with multiple health problems, such as high blood pressure and diabetes together, often can't take part because in such medical studies having multiple health problems can cause patients to respond differently to treatments than people with fewer health problems.
N-of-1 studies are a different way to design research. People with multiple health problems can take part in N-of-1 studies. An N-of-1 study has only one patient. Doctors try different treatments with that person and look for the treatment that works best. In this study, the research team wanted to know:

Whether patients and doctors thought N-of-1 studies could be useful
Which health problems patients thought N-of-1 studies could be helpful for
Which features, such as the length of the study or how much time it took to track treatment results, affected whether patients wanted to be in an N-of-1 study