Does male:female sex ratio in ankylosing spondylitis change with age?
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D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D016009:Chi-Square Distribution; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D016016:Proportional Hazards Models; D017678:Sex Distribution; D013167:Spondylitis, Ankylosing / Q000453:epidemiology*; D011795:Surveys and Questionnaires