The Roland-Morris Questionnaire (RMQ)  is a self-administered disability measure in which greater levels of disability are reflected by higher numbers on a 24-point scale. The RMQ has been shown to yield reliable measurements, which are valid for inferring the level of disability, and to be sensitive to change over time for groups of patients with low back pain.
Roland Morris Low Back Pain and Disability Questionnaire (RMQ)
 Stratford PW, Binkley J, Solomon P, Finch E, Gill C, Moreland J. Defining the minimum level of detectable change for the Roland-Morris questionnaire. Phys Ther. 1996 Apr;76(4):359-65; discussion 66-8.