Is there evidence that either ASDAS or BASDAI is superior for measuring clinical outcomes in axial spondyloarthritis?  

BASDAI and ASDAS are validated measures of AS disease activity and are used simultaneously in clinical trials. BASDAI (Bath Ankylosing Spondylitis Disease Activity Index)1 exhibits good reliability, sensitivity to change in response to intervention, has 6 questions (fatigue, back pain/hip pain, peri...