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Table 4 Correlation coefficients

From: Good correlation between changes in objective and subjective signs of inflammation in patients with short- but not long duration of axial spondyloarthritis treated with tumor necrosis factor-blockers

   Correlation coefficient ( P-value)
   All patients <4 years ≥4 years
Baseline1 BASDAI versus SIJ −0.1 (0.3) 0.1 (0.3) −0.3 (0.02)
  BASDAI versus CRP3 0.04 (0.8) 0.1 (0.7) −0.1 (0.8)
  BASFI versus SIJ −0.04 (0.7) 0.2 (0.2) −0.3 (0.1)
  BASFI versus CRP3 −0.2 (0.2) −0.2 (0.4) −0.2 (0.6)
  SIJ versus CRP3 −0.4 (0.01) −0.5 (0.005) 0 (0.995)
Differences2 BASDAI versus SIJ 0.2 (0.1) 0.4 (0.01) 0.12 (0.5)
  BASDAI versus CRP3 0.4 (0.02) 0.5 (0.01) 0.22 (0.4)
  BASFI versus SIJ 0.1 (0.3) 0.4 (0.01) 0.1 (0.7)
  BASFI versus CRP3 0.1 (0.5) 0.3 (0.2) 0.03 (0.9)
  SIJ versus CRP3 0.4 (0.02) 0.04 (0.9) 0.8 (0.01)
  1. 1Spearman correlation coefficient. 2Partial Spearman correlation coefficients of differences adjusted for the baseline status of the corresponding parameters. 3CRP-positive patients. BASDAI, Bath ankylosing spondylitis disease activity index; BASFI, Bath ankylosing spondylitis functional index; BASMI, Bath ankylosing spondylitis metrology index; ASDAS, ankylosing spondylitis disease activity score; CRP, C-reactive protein; SIJ, sacroiliac joint assessment on MRI.