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)

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