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Table 3 Comparison of clinical features of patients with rheumatoid arthritis with or without serum citrullinated inter-alpha-trypsin inhibitor heavy chain 4

From: Identification of novel biomarker as citrullinated inter-alpha-trypsin inhibitor heavy chain 4, specifically increased in sera with experimental and rheumatoid arthritis

 

Total

Citrullinated ITIH4

p Value

+

–

No. of patients (%)

60

49 (82%)

11 (18%)

 

Age, years

52.2 ± 1.9

51.3 ± 2.2

55.9 ± 3.9

0.355

Females, n (%)

48 (80%)

38 (78%)

10 (91%)

0.317

DAS28-CRP score

3.9 ± 0.2

4.1 ± 0.2

3.3 ± 0.4

0.040

CRP, mg/dl

2.18 ± 0.30

2.46 ± 0.34

0.93 ± 0.56

0.047

Anti-CCP antibodies, U/ml

131.6 ± 21.6

138.9 ± 24.6

93.4 ± 39.0

0.462

 Positive, n (%)

46 (82%)

39 (83%)

7 (78%)

0.709

RF, U/ml

210.6 ± 46.1

242.3 ± 55.0

69.5 ± 35.5

0.011

MMP-3, ng/ml

198.5 ± 21.8

214.7 ± 25.7

127.9 ± 20.1

0.122

PSL use, n (%, mean dose in mg/day)

51 (85%, 6.9)

41 (84%, 7.1)

10 (91%, 6.4)

0.544

MTX use, n (%, mean dose in mg/week)

40 (67%, 10.1)

31 (63%, 10.1)

10 (91%, 10.0)

0.075

  1. Abbreviations: ITIH4 Inter-alpha-trypsin inhibitor heavy chain 4, DAS28-CRP Disease Activity Score in 28 joints as measured by C-reactive protein, CRP C-reactive protein, CCP Cyclic citrullinated peptide, RF Rheumatoid factor, MMP-3 Matrix metalloproteinase 3, PSL Prednisolone, MTX Methotrexate
  2. Values are mean ± SEM. The cutoff value for positive citrullinated ITIH4 was band intensity of 0.46, representing the mean + 3 SD of healthy subjects