Kwan YH, Tan JJ, Phang JK, et al. - Cross-sectional data from 280 people with axial spondyloarthritis (axSpA) from a dedicated axSpA clinic in a Singapore tertiary referral hospital from 2011 to 2019 were utilized in order to evaluate the efficacy and safety of the Ankylosing Spondylitis Disease Activity Score with C-reactive protein (ASDAS-CRP) and Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) in people with axSpA in Singapore. Among 280 persons, poor internal consistency was exhibited by ASDAS-CRP, whilst high internal consistency was shown by BASDAI. When ASDAS-CRP and BASDAI were contrasted with other patient-reported outcomes measures, convergent and divergent construct efficacy was defined by the achievement of 11 out of 12 a priori hypothesis. Thus, in measuring disease activity in persons with axSpA in Singapore, this study encourages the use of both ASDAS-CRP and BASDAI.