Table 1

Characteristics of the different subgroups

GC groupNon-GC groupp Value
Number of cases555275
Age, mean±SD, years28±928±100.420
Disease duration, mean±SD, years6.7±5.96.2±6.10.085
HLA-B27 positive, n (%)*393 (88.5)152 (88.4)0.961
Male sex, n (%)242 (88)480 (86.5)0.542
SIJ grade IV, n (%)58 (21.1)165 (29.7)0.008
Spinal osteophytes, n (%)*79 (30.6)179 (34.4)0.289
ESR at baseline, mm/1 h*40±2830±250.000
CRP at baseline, mg/L*25.8±26.520.5±26.70.002
Duration of follow-up, mean±SD, years2.4±2.11.6±1.30.000
Duration of GC therapy, mean±SD, years1.7±1.6
  • *Some data were missing in these items at baseline: 214 cases of HLA-B27, 52 cases of spinal osteophytes, 80 cases of ESR, 178 cases of CRP.

  • CRP, C reactive protein; ESR, erythrocyte sedimentation rate; GC, glucocorticoid; HLA, human leucocyte antigen; SIJ, sacroiliac joint.