Table 1

Baseline characteristics of 68 patients included in the ESpAC study

CharacteristicAll patients (n=68)Patients with complete follow-up examinations (n=44)
Male gender26 (38)15 (34)
Mean age, years (SD)34.9 (10.3)36.0 (11.7)
Median symptom duration, months (IQR)18 (12–24)18 (12–24)
HLA-B27 positive31 (46)17 (39)
History of inflammatory bowel disease10 (15)7 (16)
History of anterior uveitis10 (15)8 (18)
History of psoriasis16 (24)12 (27)
History of peripheral arthritis19 (28)12 (27)
Positive family history of AS25 (37)17 (39)
CRP, in mg/l (mean (median))9 (7)9 (7)
ESR, in mm (mean (median))13 (6)13 (6)
Patients with elevated acute phase reactants (%)4137
  • The values are expressed as number (percentage) of patients or as stated otherwise.

  • AS, ankylosing spondylitis; CRP, C-reactive protein; ESpAC, Early Spondyloarthritis Cohort; ESR, erythrocyte sedimentation rate; HLA-B27, human leucocyte antigen B27.