Mean BASFI scores during long-term adalimumab treatment. Data are observed values for completers. Refer to Tables 4, 5, or 6 for number of patients at each time point. The Bath Ankylosing Spondylitis Functional Index (BASFI) measures the degree of functional limitation in patients with ankylosing spondylitis. BASFI scores range from 0 to 10, with a lower score indicating less functional limitation.