Table 1 Clinical characteristics of participants

Number of participants

–

19

41

30

–

Age (years)

–

59.68 ± 6.83

50.95 ± 11.08

56.07 ± 8.41

0.003

Duration of RA (month)

–

152.45 ± 142.21

147.14 ± 131.31

–

0.162

BMI

18.5–23.9

22.20 ± 3.69

21.33 ± 2.94

20.86 ± 3.21

0.423

WBC (×10⁹/L)

4–10

6.85 ± 2.86

5.79 ± 1.85

6.50 ± 1.60

0.089

RBC (×10¹²/L)

3.5–5.5

3.90 ± 0.61

3.89 ± 0.34

4.02 ± 0.29

0.961

HGB (g/L)

110–160

106.00 ± 23.00

107.13 ± 14.66

109.77 ± 12.02

0.818

PLT (×10⁹/L)

100–300

275.00 ± 123.94

262.87 ± 70.85

243.23 ± 29.25

0.632

ALB (g/L)

40–60

37.86 ± 4.95

37.71 ± 4.21

39.10 ± 3.98

0.907

ESR (mm/h)

0–20

50.05 ± 29.34

46.78 ± 27.10

–

0.673

CRP (mg/L)

0–20

35.89 ± 34.04

28.21 ± 29.73

–

0.431

RF-IgG (RU/ml)

0–20

28.28 ± 65.63

15.35 ± 21.28

–

0.824

RF-IgA (RU/ml)

0–20

131.43 ± 107.41

120.47 ± 99.27

–

0.697

RF-IgM(RU/ml)

0–20

260.02 ± 136.80

292.86 ± 125.36

–

0.269

Smoked (n, %)

–

0 (0.0%)

2 (4.9%)

–

1.000*

Hypertension (n, %)

–

6 (31.6%)

16 (39.0%)

–

0.774*

Diabetes (n, %)

–

3 (15.8%)

6 (14.6%)

–

1.000*

Coronary heart disease (n, %)

–

7 (36.8%)

9 (22.0%)

–

0.347*