People Strongly Value Physical Therapies for Low Back Pain Over Doing Nothing, Even When Effects Are Very Small: A Discrete Choice Experiment.

To explore factors that influence patient preferences for recommended physical therapies for low back pain. Discrete choice experiment. Respondents were randomized to a block of 12 choice tasks and asked to choose between two physical therapies or no treatment. Characteristics of the physical therapies varied between choice tasks and included type (exercise, advice and education, or clinician-directed treatment), effectiveness, time for symptoms to improve, costs, risk of side effects, and treatment duration. Choices were analyzed using a mixed logit model. Latent class analysis examined preference heterogeneity. To measure decision trade-offs, we estimated the smallest worthwhile effect and the "willingness to pay" value. A total of 697 Australians reporting a history of low back in the last year completed all choice tasks. Respondents showed a strong preference for taking any nonpharmacologic care option over no treatment ( = 17.24; 95% CI [12.89, 22.58]). This preference was present at any level of effectiveness (smallest worthwhile effect = 0%). Respondents preferred physical therapies with higher effectiveness, quicker symptom improvement, lower out-of-pocket expenses, reduced side effects, and shorter duration. Respondents were willing to pay up to A$355 per month for physical therapies over no treatment. Older and less-educated respondents had weaker preferences for physical therapies. Respondents had a strong preference for any recommended physical therapies over no treatment for low back pain, even when effects were very small. Clinicians should discuss likely effectiveness, time for improvement, side effects, and treatment duration when supporting patients to choose between recommended physical therapies. .