Mean BASDAI scores during long-term adalimumab treatment. Data are observed values for completers. Refer to Tables 4 or 6 for number of patients at each time point. The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) measures the severity of fatigue, spinal and peripheral joint pain, localized tenderness, and morning stiffness in patients with ankylosing spondylitis. BASDAI scores range from 0 to 10, with lower scores indicating less severe disease activity.