Building the Foundations: The Development of Attributes for a Discrete Choice Experiment on Spinal Manipulative Therapy for Low Back Pain in the Netherlands— The DECISION Project

When a person suffers from lower back pain, the path to relief is rarely a straight line. Clinical guidelines often suggest several different ways to treat the discomfort, yet none stands out as the single best option. This leaves patients with a difficult task: weighing the promise of pain relief against the time, money, and effort required to get there. One popular option is spinal manipulative therapy, a hands-on treatment where a practitioner moves the spine to improve function and reduce pain. To help doctors and patients make better choices, researchers use a method called a discrete choice experiment. This approach asks people to imagine different treatment scenarios and choose between them, revealing what factors truly drive their decisions. However, for this method to work, the researchers must first know exactly which factors to ask about. If they ask the wrong questions, the answers will not reflect reality.

A team of researchers in the Netherlands set out to solve this problem specifically for patients considering spinal manipulative therapy. They wanted to find the six most important factors that influence a Dutch patient's decision to undergo this treatment. To do this, they did not simply guess or rely on old lists. Instead, they built a new foundation from the ground up, starting with a review of existing scientific literature and then moving into direct conversation with real people. They began by gathering a long list of forty potential factors, such as the type of movement used by the therapist or the intensity of exercises. They then refined this list by speaking with thirteen patients who had already chosen this therapy. These interviews helped them understand what the patients actually cared about, stripping away factors that were irrelevant or too vague to measure in a study.

The process continued with a series of small group discussions. The researchers brought together four patients and six healthcare providers, including chiropractors, manual therapists, and osteopaths. In these sessions, the participants ranked the remaining factors to see which ones mattered most. The results were clear and consistent. Every single patient agreed that the most critical factor was effectiveness: they wanted to know if the treatment would actually stop their pain and help them sleep or move better. The next most important factors were practical. Patients cared deeply about how often they would need to visit the clinic and how long the entire treatment plan would last. These two elements are linked, as more frequent visits usually mean a longer commitment and higher costs.

While effectiveness, frequency, and duration were the top priorities, the researchers kept other factors in the mix for a specific reason. Even though patients did not rank side effects, the need to do home exercises, or the cost of treatment as highly as they ranked effectiveness, the research team decided these could not be ignored. The team realized that the people they spoke with had already decided to try the therapy, so they might have overlooked risks or costs that would stop a different person from trying it at all. To ensure the final study would capture the views of everyone, including those who might hesitate, the team included these elements. They combined similar ideas, such as merging "pain during treatment" and "mild side effects" into a single category called side effects, and grouped home exercises with lifestyle changes under the heading of self-management.

The final result of this careful, step-by-step process is a set of six specific attributes that will form the basis of a new study. These six factors are effectiveness, treatment frequency, the duration of the treatment plan, side effects, the requirement to do self-management exercises, and out-of-pocket costs. By narrowing down the list to these six, the researchers have created a tool that is both manageable for participants to understand and comprehensive enough to reflect the complex reality of choosing a treatment. This work ensures that future studies will not just ask patients what they think in a general sense, but will measure the specific trade-offs they are willing to make between getting better and the time, money, and effort it takes to get there.