CRP and ankylosing spondylitis: Likewise, patients with available disease-specific clinical scores (Ankylosing Spondylitis Disease Activity Score with C-reactive protein, Bath Ankylosing Spondylitis Disease Activity Index, Bath Ankylosing Spondylitis Functional Index, Bath Ankylosing Spondylitis Metrology Index [BASMI]) and those using biologic DMARDs were also divided into 2 groups based on the presence of LSTV and were analyzed accordingly.