Table 1.

Clinical features of patients with juvenile idiopathic arthritis

Subclass	n	Female/male	Age in years (median [range])	Disease duration in months (median [range])	B27+ (n)	ANA+ (n)
Oligoarthritis	13	8/5	8 (2–17)	34 (6–106)	1	6
Ext. oligoarthritis	2	2/0	12 (10–14)	98 (65–131)	0	1
Systemic arthritis	1	0/1	15	156	0	0
Psoriatic	8	4/4	13 (6–15)	42 (5–175)	2	6
ERA	7	1/6	13 (9–14)	12 (1–60)	3	2
Polyarthritis RF-	5	1/4	10 (5–14)	10 (4–129)	1	3
Polyarthritis RF+	1	1/0	15	12	0	0
Other	2	0/2	11 (9–13)	3 (3–3)	0	0
Total	39	17/22	11 (2–17)	27 (1–175)	7	18

ANA, antinuclear antibody; RF, rheumatoid factor;