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How common is ankylosing spondylitis and who is most likely to get It?
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In the United States, AS affects about 0.2-0.5% of the population. Men are about 2 to 3 times more likely to be affected by AS than women, and it usually begins between late teens to age 40. When AS symptoms begin at the age of 16 or younger, it is called juvenile-onset AS.

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