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Table 2 Demographic and clinical characteristics of RA patients according to BMI

From: Serum leptin and serum leptin/serum leptin receptor ratio imbalance in obese rheumatoid arthritis patients positive for anti-cyclic citrullinated peptide antibodies

Measurement

All

Normal weight

Preobese

Obese

BMI 18.50–24.99 kg/m2

BMI 25.00–29.99 kg/m2

BMI ≥30.00 kg/m2

n = 64

n = 21

n = 21

n = 22

Female gender, n (%)

60 (93.8)

19 (90.5)

20 (95.2)

21 (95.5)

Time of disease evolution, years

5.34 ± 6.97

5.73 ± 8.95

5.06 ± 4.80

5.23 ± 6.78

Positive anti-CCP, n (%)

46 (71.9)

15 (71.4)

13 (61.9)

18 (81.8)

Anti-CCP, U/Ml

167.20 ± 305.49

179.03 ± 405.53

218.45 ± 338.76

107.00 ± 86.53

Positive RF, n (%)

41 (65.1)

13 (61.9)

15 (71.4)

13 (61.9)

RF, UI/Ml

79.39 ± 51.57

93.03 ± 43.26

79.65 ± 60.09

68.01 ± 47.61

ESR, mm/h

21.27 ± 12.74

19.38 ± 9.82

17.10 ± 12.14

27.33 ± 14.08b

CRP, mg/L

9.14 ± 7.71

7.66 ± 7.08

8.83 ± 6.67

11.02 ± 9.19

DAS-28-based CRP

3.40 ± 1.30

2.90 ± 1.20

3.82 ± 1.24

3.53 ± 1.36

TNFα, pg/Ml

57.05 ± 39.87

62.03 ± 34.40

60.93 ± 53.82

48.83 ± 27.48

sLep, ng/Ml

119.70 ± 104.64

45.98 ± 40.26a

121.65 ± 106.35

188.21 ± 100.88

sLepR, ng/Ml

50.45 ± 17.25

60.02 ± 18.81c

51.34 ± 12.51

37.49 ± 9.67

sLep/sLepR, ng/mL

2.87 ± 3.19

0.98 ± 1.40a

2.45 ± 2.45

5.67 ± 3.56

Insulin resistance, n (%)

18 (36.7)

5 (26.3)

5 (35.7)

8 (50.0)

  1. Continuous variables are represented as mean ± standard deviation; qualitative variables are represented as number (%). Groups were compared with one-way analysis of variance and Dunnet’s T3 post hoc test. aNormal weight vs. preobese and obese; bpreobese vs. obese; cNormal weight vs. obese. BMI body mass index, anti-CCP anti-cyclic citrullinated peptide antibodies, RF rheumatoid factor, ESR erythrocyte sedimention rate, CRP C-Reactive protein, TNF tumor necrosis factor, sLep soluble leptin), sLepR soluble leptin receptor, HOMA-IR homeostatic model assessment, DAS-28 disease activity index in 28 joints