Figure 1

Drug retention rates of biologic disease modifying antirheumatic drug (bDMARD). (A) Drug retention rate of overall late onset ankylosing spondylitis (LOAS) and young onset ankylosing spondylitis (YOAS). LOAS showed lower drug retention rate than YOAS. Drug retention rates of each bDMARDs in LOAS (B) and YOAS (C).