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Table 2 Antibody concentration and positivity in JIA subtypes (n = 96)

From: Evidence of fibrinogen as a target of citrullination in IgM rheumatoid factor-positive polyarticular juvenile idiopathic arthritis

 

Poly RF+

n = 16

Mean ± SD

Poly RF-

n = 36 Mean

± SD

Oligo

n = 25 Mean

± SD

Systemic

n = 13 Mean

± SD

Enthesitis

n = 3

Mean

Psoriatic

n = 3

Mean

Citrullinated Fibrinogen (OD)

Positivity n(%)

1.6 ± 1.1

13 (81.3%)

0.60 ± 0.75

11(30.6%)

0.54 ± 0.65

6(24.0%)

0.36 ± 0.18

1(7.7%)

0.37

0(0%)

0.28

0(0%)

Citrullinated α-Enolase (OD)

Positivity n(%)

0.54 ± 0.49

3(18.8%)

0.47 ± 0.51

2(5.6%)

0.35 ± 0.16

0(0%)

0.40 ± 0.24

1(7.7%)

1.6

2(66.7%)

1.2

1(33.3%)

IgG CCP (U)

Positivity n(%)

109.9 ± 116.4

9(56.3%)

18.3 ± 63.96

5(13.9%)

0.76 ± 12.7

0(0%)

4.5 ± 11.4

0(0%)

3.7

0(0%)

1.6

0(0%)

IgA CCP (OD)

Positivity n(%)

0.28 ± 0.56

4(25.0%)

0.11 ± 0.21

6(16.7%)

0.04 ± 0.02

0(0%)

0.04 ± 0.04

0(0%)

0.09

0(0%)

0.04

0(0%)

IgM CCP (OD)

Positivity n(%)

0.91 ± 1.2

5(31.3%)

0.53 ± 0.77

10(27.8%)

0.17 ± 0.09

0(0%)

0.20 ± 0.12

1(7.7%)

0.13

0(0%)

0.31

0(0%)

IgA RF (U)

Positivity n(%)

19.4 ± 29.8

10(62.5%)

1.7 ± 4.5

4(11.1%)

1.1 ± 2.4

0(0%)

0.99 ± 3.4

1(7.7%)

2.1

0(0%)

0.15

0(0%)

IgM RF (U)

Positivity n(%)

66.3 ± 52.4

16(100%)

14.8 ± 23.5

17(47.2%)

3.6 ± 11.0

5(20.0%)

15.2 ± 18.1

8(61.5%)

3.3

0(0%)

2.9

0(0%)

  1. Continuous variables are expressed as means ± SD. Anti-CCP antibodies: anti-cyclic citrullinated peptide antibodies; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; n: number of patients; OD: optical density; RF: rheumatoid factor; U: Units. Cut points for positive values: Anti-citrullinated fibrinogen antibodies (OD≥0.59), Anti-citrullinated α-enolase antibodies (OD≥0.91), IgG anti-CCP antibodies (≥20U), IgA anti-CCP antibodies (OD≥0.16), IgM anti-CCP antibodies (OD≥0.43), IgA RF (≥6U), IgM RF (≥6U).