Table 1

Characteristics of patients completing the study

Total (n=209)The Netherlands (n=130)France (n=53)Belgium (n=26)
*p Value for difference among countries <0.05 (tested by χ2 for proportions and ANOVA for continuous variables).
IBD, inflammatory bowel disease; 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).
Male (%)70716873
Age (years), mean (range)*43.1 (18–77)45.6 (23–77)37.4 (19–67)41.9 (18–74)
Education ⩽12 years (%)*72834865
Disease duration (years), mean (SD)11.1 (8.9)11.9 (9.2)9.2 (7.4)10.8 (10.3)
IBD (%)*71008
Peripheral arthritis (%)2529269
BASFI baseline, mean (SD)*3.3 (2.6)3.9 (2.4)2.5 (2.9)2.6 (2.3)
BASDAI baseline, mean (SD)3.3 (2.1)3.7 (2.1)2.8 (2.3)3.1 (1.9)