TableĀ 4

Domains adjusted for cross-cultural DIF

ASPsASScSLEFMS
PainXXSSS
MovementsSSSXS
FeelingsSSSSS
Disease processSXSSS
TreatmentsSXXXS
Self-helpSXSSS
SupportXXXSS
  • AS, ankylosing spondylitis; DIF, differential item functioning; FMS, fibromyalgia syndrome; PsA, psoriatic arthritis; S, cross-cultural invariance satisfied; SLE, systemic lupus erythematosus; SSc, systemic sclerosis; X, lack of cross-cultural invariance.