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Table 6 Clinical outcomes and patient-reported outcome measures for patients with nonradiographic axial spondyloarthritis, ankylosing spondylitis, and other inflammatory back pain

From: The prevalence and clinical characteristics of nonradiographic axial spondyloarthritis among patients with inflammatory back pain in rheumatology practices: a multinational, multicenter study

  Total (N = 686) nr-axSpA (N = 188) AS (N = 413) Other IBP (N = 85) p Value
ASDAS score (ESR)      0.003
 Number of patients 619 167 378 74  
 Mean ± SD 2.87 ± 1.14 2.62 ± 1.17 2.97 ± 1.13 2.92 ± 1.01  
ASDAS score (CRP)      0.002
 Number of patients 559 149 346 64  
 Mean ± SD 2.81 ± 1.19 2.52 ± 1.21 2.93 ± 1.18 2.81 ± 1.17  
BASDAI      0.010
 Number of patients 681 186 412 83  
 Mean ± SD 4.44 ± 2.24 4.03 ± 2.32 4.56 ± 2.17 4.77 ± 2.29  
BASFI      <0.001
 Number of patients 683 187 411 85  
 Mean ± SD 4.09 ± 2.59 3.20 ± 2.47 4.43 ± 2.57 4.38 ± 2.49  
BASMI (11-point)      <0.001
 Number of patients 575 154 353 68  
 Mean ± SD 3.55 ± 2.03 2.41 ± 1.54 4.09 ± 2.06 3.33 ± 1.75  
BASMI (3-point)      <0.001
 Number of patients 564 146 347 71  
 Mean ± SD 2.83 ± 2.19 1.62 ± 1.51 3.40 ± 2.25 2.52 ± 2.03  
BASMI (linear function)      <0.001
 Number of patients 686 188 413 85  
 Mean ± SD 4.44 ± 2.55 3.71 ± 2.77 4.77 ± 2.38 4.47 ± 2.50  
  1. Abbreviation: AS ankylosing spondylitis, ASDAS Ankylosing Spondylitis Disease Activity Score, BASDAI Bath Ankylosing Spondylitis Disease Activity Index, BASFI Bath Ankylosing Spondylitis Functional Index, BASMI Bath Ankylosing Spondylitis Metrology Index, CRP C-reactive protein, ESR erythrocyte sedimentation rate, IBP inflammatory back pain, nr-axSpA nonradiographic axial spondyloarthritis
  2. The p values represent the omnibus statistical comparison of percentages (or means) across IBP groups based on the F-test values