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

Updated: Feb 02, 2021
  • Author: Lawrence H Brent, MD; Chief Editor: Herbert S Diamond, MD  more...
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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, [60] and clinical AS is more common in men than in women, with a male-to-female ratio of approximately 3:1. [6, 56] Females may have milder or subclinical disease. The male-to-female ratio for USpA is 1:3. [59]

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