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); EQ-5D, EuroQol 5 dimensions (0 equals death and 1 perfect health).
Male (%)70.370.867.973.1
Age (years), mean [range]*43.1 [18–77]45.6 [23–77]37.4 [19–67]41.9 [18–74]
Education ⩽12 years (%)*71.882.848.165.4
Disease duration (years), mean (SD)11.1 (8.9)11.9 (9.2)9.2 (7.4)10.8 (10.3)
IBD (%)*7.210.00.07.7
Peripheral arthritis (%)25.428.526.48.7
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)
Time averaged EQ-5D, mean (SD)0.67 (0.19)0.68 (0.16)0.63 (0.23)0.67 (0.14)