European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
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Randomized Controlled Trial Multicenter Study Comparative Study
Psychometric properties of the functional rating index in patients with low back pain.
The purpose of this study was to validate the psychometric properties of the functional rating index (FRI), establish the instrument's minimum clinically important difference (MCID), and compare its psychometric properties with the Oswestry questionnaire. ⋯ The FRI is less reliable than the Oswestry but appears to have comparable validity and responsiveness. Before the FRI can be recommended for widespread use in patients with neck and low back pain, it should be further tested in patients with neck pain.