Skip to main content

Table 1 The demographic and clinical characteristics of AS patients positive and negative for sydesmophyte

From: ERAP1 genetic variations associated with HLA-B27 interaction and disease severity of syndesmophytes formation in Taiwanese ankylosing spondylitis

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%)   
  1. 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)
  2. mSASSS, modified Stoke's Ankylosing Spondylitis Spinal Score