JIA is an umbrella: Oligoarticular jia involves four joints or fewer accounts for about 60 percent of children with jia, mostly girls, typically begins between the ages of 1 and 5 tends to involve large joints, such as the knees, ankles and elbows. Polyarticular jia involves five or more joints accounts for about 20 percent of children with jia, mostly girlscan begin at any age, tends to involve the small joints
Answered 4/20/2013
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