Comparison of the SF6D, the EQ5D, and the oswestry disability index in patients with chronic low back pain and degenerative disc disease

This study indicates that the difference in important measurement properties between EQ5D and SF6D is too large to consider them interchangeable. Since the similarity with the "gold standard" (the disease-specific instrument) was quite different, this could indicate that the choice of index should be determined by the diagnosis.