Some studies have reported poor correlations between clinical measures of ankylosing spondylitis (AS) disease activity, such as the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI ...

Primary outcome was disease activity measured with the Ankylosing Spondylitis (AS) Disease Activity Scale (ASDAS, higher score=worst) and the Bath AS Disease Activity Index (BASDAI, 0–10, 10=worst).