Table 1

The demographic and clinical characteristics of AS patients positive and negative for sydesmophyte

Clinical characteristic

AS

N = 797 (%)

Sydesmophyte positive

N = 393 (%)

Sydesmophyte negative

N = 404 (%)


Gender (female)

130 (16.3%)

26 (15.1%)

104 (25.7%)

Age at onset

≤16

117 (14.7%)

55 (14.0%)

62 (15.4%)

17 to 40

533 (66.9%)

274 (69.7%)

259 (64.1%)

41 to 60

47 (5.9%)

12 (3.1%)

35 (8.7%)

>60

1 (0.1%)

0 (0%)

1 (0.2%)

Undetermined

99 (12.4%)

52 (13.2%)

47 (11.6%)

Disease duration

<5 years

20 (2.5%)

4 (1.0%)

16 (4.0%)

5 to 10 years

118 (14.8%)

17 (4.3%)

101 (25.0%)

11 to 15 years

134 (16.8%)

54 (13.8%)

80 (19.8%)

16 to 20 years

125(15.7%)

52 (13.2%)

73 (18.1%)

>20 years

301 (37.8%)

214 (54.5%)

87 (21.5%)

Undetermined

99 (12.4%)

52 (13.2%)

47 (11.6%)

HLA-B27 positivity

739 (92.7%)

380 (96.7%)

359 (88.9%)

Baseline mSASSS at evaluati on

mSASSS <3

404 (50.7%)

mSASSS <24

120 (15.0%)

mSASSS ≤24

273 (34.3%)


Sydesmophyte positive: AS patients with syndesmophyte formations (N = 393; mSASSS <24 plus mSASSS ≤24). Sydesmophyte negative, AS patients without syndesmophyte formations (N = 404; mSASSS <3)

mSASSS, modified Stoke's Ankylosing Spondylitis Spinal Score

Wang et al. Arthritis Research & Therapy 2012 14:R125   doi:10.1186/ar3855

Open Data