Table 1 Descriptive characteristics of 353 patients with radiographic axial spondyloarthritis

Sex

353

220 (62.3)

133 (37.7)

Age, years

52.2 ± 12.7

51.7 ± 13.0

53.0 ± 12.2

0.4

BMI, kg/m²

26.8 ± 4.9

27.2 ± 5.0

25.9 ± 4.6

0.008

Current smoker

39 (11)

24 (10.9)

15 (11.3)

0.9

Ever smoker

168 (47.6)

103 (46.8)

65 (48.9)

0.7

r-axSpA variables

Symptom duration, years

27.1 ± 13.0^a

26.8 ± 12.8^d

27.5 ± 13.4^e

0.7

HLA-B27-positive

324 (91.8)

210 (95.5)

114 (85.7)

0.001

ESR, mm/h

14.6 ± 12.8, 11 (6, 19)

13.2 ± 12.3, 10 (5, 17)

16.8 ± 13.4, 14.0 (8, 23)

0.009

hsCRP, mg/L

5.4 ± 8.3, 2.8 (1, 6)^b

6.1 ± 9.5, 3.0 (1, 7)

4.4 ± 5.9, 2.1 (1, 5)^e

0.04

History of anterior uveitis

181 (51.2)

117 (53.2)

64 (48.1)

0.4

History of peripheral arthritis

206 (58.4)

118 (53.6)

88 (66.2)

0.02

History of coxitis

47 (13.3)

27 (12.3)

20 (15.0)

0.5

BASDAI, score

3.6 ± 2.0^a

3.4 ± 2.1^f

4.0 ± 2.0

0.006

ASDAS CRP, score

2.0 ± 0.9^b

2.0 ± 0.9 ^g

2.1 ± 0.8

0.4

BASFI, score

2.8 ± 2.1^c

2.7 ± 2.0 ^g

2.9 ± 2.1^e

0.2

BASMI, score

3.5 ± 1.7

3.7 ± 1.8

3.3 ± 1.4

0.01

BASDAI QN1 Fatigue

4.6 ± 2.6

4.2 ± 2.5

5.2 ± 2.6

0.001

BASDAI QN4 Level of discomfort

3.0 ± 2.7^c

2.6 ± 2.4^d

3.7 ± 2.8

 < 0.001

mSASSS, score

15.5 ± 19.7, 6 (0, 24)^c

20.5 ± 21.6, 11.5 (2, 34)^d

7.4 ± 12.5, 2.0 (0, 10)

 < 0.001

mSASSS cervical, score

7.0 ± 11.2, 1.0 (0, 9)^c

9.6 ± 12.5, 2.5 (0, 17)^d

2.8 ± 6.9, 0.0 (0, 2)

 < 0.001

Days to X-rays

36.0 ± 32.5, 27.5 (21, 41)^c

38.7 ± 39.6, 27.0 (21, 40)^d

31.4 ± 13.6, 28.0 (22, 41)

0.007

Swollen joint count 66

0.2 ± 0.9^b

0.2 ± 1.0

0.1 ± 0.8^e

0.9

Tender joint count 68

1.3 ± 4.9

0.4 ± 1.2

2.8 ± 7.5

 < 0.001

Delay of diagnosis, years

9.2 ± 8.1^a

8.0 ± 7.5^d

11.3 ± 8.6^e

 < 0.001

csDMARD monotherapy

40 (11.3)

21 (9.5)

19 (14.3)

0.2

bDMARD monotherapy

29 (8.2)

20 (9.1)

9 (6.8)

0.4

csDMARD and bDMARD

40 (11.3)

29 (13.2)

11 (8.3)

0.2

NSAID, regular or on demand

279 (79.3)^b

170 (77.3)

109 (82.0)^e

0.2