Table 2

Spearman correlation between ASAS Health Index scores and other PRO

HypothesisSpearman correlationConfirmation*
Spinal painHigh0.54Yes
Patient globalHigh0.57Yes
Physician globalModerate0.49Yes
HADS anxietyModerate−0.55No
HADS depressionModerate−0.57No
EQ-5D VAS (0–100 mm)High0.45No
SF-36 PSCHigh−0.73Yes
SF-36 MSCModerate−0.59No
WPAI presenteeismModerate0.60No
WPAI absenteeismModerate0.38Yes
Well-being last weekHigh0.61Yes
  • *Column indicates whether hypothesis generated prior to analysis about magnitude and direction of correlation was confirmed in the specific variable.

  • ASDAS, Ankylosing Spondylitis Disease Activity Score; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Functional Index; EQ-5D, Euro Quality of Life 5 Dimensions; HADS, Hospital Anxiety Depression Scale; MSC, mental sum component; PSC, physical sum component; SF-36, Short Form 36; VAS, Visual Analogue Scale; WPAI, Work Productivity and Impairment Scale.