<prompt> All are TRUE about juvenile ahritis EXCEPTRheumatoid factor positiveIncreased ESRHepatosplenomegalyFever with rash  <response>: Criteria for the classification of JRA Age at onset 16 years Ahritis Swelling or effusion or presence of two or more of the following signs limitation of range of motion, tenderness or pain on motion, and increased heat in one or more joints -Duration of disease 6 weeks or loner - Onset type defined by type of disease in first 6 months - Polyahritis - 5 or more inflamed joints - Oligoahritis Pauciaicular 5 inflamed joints - Systemic ahritis with characteristic fever -Exclusion of other forms of juvenile ahritis. -Pauciaicular JRA is the most frequent type of JRA accounting for about 60 of patients -Antinuclear antibodies ANA are frequently positive Rheumatoid factor is negative, is seen in pauciaicular and systemic JRA and Rheumatoid factor positive in polyaicular JRA and poends a poor prognosis - ANAs are present in at least 40 to 85 of all children with pauciaicular or polyaicular IRA, but are unusual in children with systemic onset JRA Lyme ahritis - recurrent episodes of asymmetric ahritis of large joints -A chronic migratory skin rash -Neurologic involvement aseptic meningitis, myelitis, chorea - Rheumatoid factor is negative 