Determinants of total direct annual costs from societal perspective assessed by Cox’s regression analysis
| HR (95% CI)* | p Value | |
|---|---|---|
| *HRs <1 indicate higher costs. | ||
| BASFI, Bath Ankylosing Spondylitis Functional Index (range 0–10, higher values indicating worse function); BASDAI, Bath Ankylosing Spondylitis Disease Activity Index (range 0–10, higher values indicating higher disease activity). | ||
| France as opposed to the Netherlands | 0.99 (0.68 to 1.47) | 0.75 |
| Belgium as opposed to the Netherlands | 0.93 (0.56 to 1.52) | 0.77 |
| Belgium as opposed to France | 0.93 (0.54 to 1.56) | 0.77 |
| Female gender | 1.33 (0.09 to 1.85) | 0.09 |
| Disease duration in years | 1.03 (1.02 to 1.05) | 0.002 |
| Education (⩽12 years) | 1.49 (1.04 to 2.17) | 0.03 |
| BASFI baseline | 1.10 (1.01 to 1.19) | 0.03 |
| BASDAI baseline | 1.27 (1.12 to 1.41) | <0.0001 |