Sacro-ilitis in eight populations.
D000293:Adolescent; D000328:Adult; D000368:Aged; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007198:Indians, North American; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012446:Sacroiliac Joint / Q000000981:diagnostic imaging; D013167:Spondylitis, Ankylosing / Q000453:epidemiology*; D014481:United States