A longitudinal study of disease activity and functional status in a hospital cohort of patients with ankylosing spondylitis

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Abstract
Objective. To evaluate changes in functional status and disease activity and their determinants in patients with ankylosing spondylitis (AS) attending hospital, using the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) and the Bath Ankylosing Spondylitis Functional Index (BASFI).