How does the prevalence of ankylosing spondylitis (AS) and undifferentiated spondyloarthropathy (USpA) vary by sex?

Updated: Sep 03, 2019
  • Author: Lawrence H Brent, MD; Chief Editor: Herbert S Diamond, MD  more...
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Answer

According to radiographic survey studies, prevalence rates of AS are approximately equal in men and women. However, men have more severe radiographic changes in the spine and hips than women, [56] and clinical AS is more common in men than in women, with a male-to-female ratio of approximately 3:1. [5, 52] Females may have milder or subclinical disease. The male-to-female ratio for USpA is 1:3. [55]


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