Developing mapping algorithms to predict EQ-5D health utility values from Bath Ankylosing Spondylitis Disease Activity Index and Bath Ankylosing Spondylitis Functional Index among patients with Ankylosing Spondylitis.

Although the prevalence of AS in mainland China between 2005 and 2019 (0.22–0.35%) was lower than that in the United States (0.9–1.4% from 2009 to 2010) and that in central Europe (0.3–0.5% from 2000 to 2006), it has shown an increasing trend [ 1 , 2 , 6 ].

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