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Table 2 Comparison of disease activity after 1-year follow-up and change of disease activity according to clusters

From: A cluster analysis of patients with axial spondyloarthritis using tumour necrosis factor alpha inhibitors based on clinical characteristics

  Axial group (n = 828) Extra-axial group (n = 214) p-value
SJC at follow-up 0.12 (1.26) 0.23 (1.07) 0.221
TJC at follow-up 0.24 (1.63) 0.72 (3.46) 0.104
BASDAI at follow-up 2.60 (2.11) 2.63 (2.18) 0.840
BASFI at follow-up 1.53 (1.91) 1.32 (1.71) 0.187
ASDAS-ESR at follow-up 1.76 (1.00) 1.78 (0.95) 0.840
ASDAS-CRP at follow-up 1.61 (1.04) 1.48 (0.97) 0.123
ESR at follow-up (mm/h) 12.04 (15.49) 12.29 (14.99) 0.840
CRP at follow-up (mg/dL) 0.46 (0.98) 0.42 (1.05) 0.704
Δ SJC − 0.37 (1.78) − 0.98 (1.98) < 0.001
Δ TJC − 0.46 (2.08) − 1.60 (2.27) < 0.001
Δ BASDAI − 3.36 (2.50) − 3.75 (2.64) 0.104
Δ BASFI − 1.92 (2.37) − 2.34 (2.63) 0.096
Δ ASDAS-ESR − 1.90 (1.25) − 2.27 (1.34) 0.001
Δ ASDAS-CRP − 2.00 (1.28) − 2.40 (1.43) 0.001
Δ ESR (mm/h) − 23.65 (28.45) − 34.17 (31.38) < 0.001
Δ CRP (mg/dL) − 1.62 (2.72) − 2.41 (3.62) 0.014
ASAS 20 444 (60.6) 131 (66.5) 0.196
  1. SJC swollen joint count, TJC tender joint count, BASDAI Bath Ankylosing Spondylitis Disease Activity Index, BASFI Bath Ankylosing Spondylitis Functional Index, ESR erythrocyte sedimentation rate, CRP C-reactive protein, ASDAS-ESR Ankylosing Spondylitis Disease Activity Score based on ESR, ASDAS-CRP Ankylosing Spondylitis Disease Activity Score based on CRP, ASAS 20 Assessment of SpondyloArthritis International Society 20% improvement criteria