Changes in MACTAR scores for patients with chronic low back pain who considered that their condition had improved, had not changed, and had deteriorated at 6-month follow-up.

MACTAR: McMaster-Toronto Arthritis Patient Preference Disability Questionnaire P value: comparison between patient opinion status acceptable vs. not acceptable. Comparisons were performed by Mann Whitney test. This test was performed after recoding the actual status of health in two groups: condition considered improved or deteriorated (identical and worse). *considering priorities defined at baseline at 6-month evaluation; **considering shifts in priorities at 6-month evaluation.