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Table 1 Convergent validity analysis: correlation matrix (Spearmanʼs rho) of the ASAS HI Questionnaire versus anthropometric measures (BASMI), specific and generic HRQoL questionnaires (ASQoL and EQ-5D), functional disability (BASFI) and disease activity scores (BASDAI, ASDAS-CRP and SASDAS)

From: Clinimetric properties of the ASAS health index in a cohort of Italian patients with axial spondyloarthritis

  ASQoL BASDAI BASFI BASMI EQ-5D SASDAS ASDAS-CRP
ASAS HI 0.784 0.568 0.671 0.303 −0.460 0.640 0.564
<0.0001 <0.0001 <0.0001 0.0003 <0.0001 <0.0001 <0.0001
ASQoL   0.645 0.626 0.271 −0.436 0.689 0.620
  <0.0001 <0.0001 0.0012 <0.0001 <0.0001 <0.0001
BASDAI    0.586 0.192 −0.453 0.868 0.757
   <0.0001 0.0229 <0.0001 <0.0001 <0.0001
BASFI     0.578 −0.329 0.723 0.624
    <0.0001 0.0001 <0.0001 <0.0001
BASMI      −0.160 0.321 0.289
     0.0590 0.0001 0.0005
EQ-5D       −0.407 −0.418
      <0.0001 <0.0001
SASDAS        0.845
       <0.0001
  1. Spearman rank correlation coefficient
  2. Abbreviations: ASAS HI Assessment of SpondyloArthritis international Society Health Index, ASQoL Ankylosing Spondylitis Quality of Life Scale, BASDAI Bath Ankylosing Spondylitis Disease Activity Index, BASFI Bath Ankylosing Spondylitis Functional Index, BASMI Bath Ankylosing Spondylitis Metrology Index,EQ-5D EuroQoL Five Dimensional Questionnaire, SASDAS Simplified Ankylosing Spondylitis Disease Activity Index, ASDAS Ankylosing Spondylitis Disease Activity Score, CRP C-Reactive Protein