Table 1

 Baseline characteristics of all patients

All patients (n = 116)Patients used for calculation of the SDC (n = 78)p Value*
BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Function Index; BASMI, Bath Ankylosing Spondylitis Metrology Index; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; mSASSS, modified Stokes AS Spinal Score; SDC, smallest detectable change.
*Comparison of the subgroup of patients used for the calculation of the SDC with the subgroup of the remaining patients by Mann–Whitney U test.
Values are mean (SD) unless otherwise specified.
mSASSS9.3 (14.0)10.1 (14.6)0.16
Age (years)38.4 (9.7)38.9 (10.7)0.96
Symptoms duration (years)11.0 (8.2)11.9 (9.1)0.10
BASDAI (scale 0–10)5.1 (2.2)4.8 (2.3)0.91
BASFI (scale 0–10)2.9 (2.0)3.9 (2.5)0.63
BASMI (scale 0–10)4.3 (2.5)2.8 (2.0)0.22
CRP (mg/dl)26.5 (23.4)22.2 (18.6)0.65
ESR (mm/1 h)27.8 (20.3)26.4 (20.4)0.62