The prevalence of axial spondyloarthritis (axSpA) or<unk><unk>  in a population depends upon the following 1)Ethnic groups 2) Selection of subjects for evaluation and 3) The criteria for diagnosis.It shows a clear evidence that correlation between the prevalence of<unk><unk>  (AS)/axial spondyloarthritis (axSpA)  in a given population and the prevalence of human leukocyte antigen HLA-B27 exits.
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