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Table 2 Distribution of JIA subtypes by gender and age of onset

From: Juvenile idiopathic arthritis in Jordan: single center experience

JIA subtype

n (%)

Gender

Age of onset (yr)

Male

Female

Range

Mean

Oligoarthritis

115 (54.7%)

39 (34%)

76 (66%)

10 mo- 14 yr

5.0 ± 3.2 yr

R.F (−) polyarthritis

18 (8.5%)

6 (33%)

12 (66%)

4 yr. −12 yr

8.0 ± 3.2 yr

R.F (+) polyarthritis

8 (3.8%)

2 (25%)

6 (75%)

4 yr. −12 yr

8.0 ± 3.2 yr

Systemic arthritis

36 (17.1%)

20 (56%)

16 (44%)

9 mo- 13 yr

3.8 ± 2.7 yr

Enthesitis-related arthritis

15 (7.1%)

9 (60%)

6 (40%)

6 yr- 12 yr

10 ± 1.77 yr

Psoriatic arthritis

18 (8.5%)

10 (56%)

8 (44%)

7 mo- 11 yr

5.5 ± 3.9 yr

  1. JIA Juvenile Idiopathic Arthritis, RF Rheumatoid factor, mo months, yr years