Age

Median (Q1; Q2)

41 (30; 52)

42 (34; 68)

p = 0.17

Min; max

16; 81

17; 80

Home

Urban

206/261 (78.9%)

24/33 (72.70%)

p = 0.42

Rural/semi-urban

55/261 (21.1%)

9/33 (40.0%)

Disease Activity Score 28 (DAS 28)

Median (Q1; Q2)

6.5 (5.5; 7.3)

6.5 (5.1; 7.1)

p = 0.40

Min; max

1.4; 9.7

2.7; 7.7

Duration of symptoms (months)

Median (Q1; Q2)

46 (25; 90)

44 (22; 84)

p = 0.48

Min; max

1; 382

5; 260

Joint disorders

Ulnar deviation of fingers

102/273 (37.4%)

12/35 (34.3%)

p = 0.72

Swan-neck finger

8/273 (2.9%)

4/35 (11.4%)

p = 0.04

Mallet-shaped finger

10/273 (3.7%)

3/35 (8.6%)

p = 0.17

Radio carpal camel-back

15/273 (5.5%)

0/35 (0%)

p = 0.23

Instable ulnar styloid

12/273 (4.4%)

1/35 (2.9%)

p > 0.99

Loss of flexion

38/273 (13.9%)

6/35 (17.1%)

p = 0.61

Z-shaped thumb

35/273 (12.8%)

8/35 (22.9%)

p = 0.12

Boutonniere

63/273 (23.1%)

5/35 (14.3%)

p = 0.24

No deformation

129/273 (47.3%)

14/35 (40%)

p = 0.42

Extra-articular symptoms

p = 0.56

Anemia

96/273 (35.2%)

6/35 (17.1%)

p = 0.03

Dry eye syndrome

78/273 (28.6%)

12/35 (34.3%)

p = 0.48

Interstitial lung disease

4/273 (1.5%)

2/35 (5.7%)

p = 0.09

Rheumatoid nodules

3/273 (1.1%)

1/35 (2.9%)

p = 0.38

Adenopathy

2/273 (0.7%)

2/35 (5.7%)

p = 0.07