Table 3

 Detailed comparison of radiographic and clinical characteristics in different relevant subgroups of patients

Age (years)Male n (%)Damage at BL n (%)Definite damage at BL n (%)Ambiguous syndesmophytes n (%)Mean mSASSSMean BASDAIMean CRPMean BASFIMean BASMI
BL, baseline; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Function Index; BASMI, Bath Ankylosing Spondylitis Metrology Index; CRP, C-reactive protein; mSASSS, modified Stokes Ankylosing Spondylitis Spinal Score; NA, not available.
Age ⩽ mean age (38 years, n = 67)31.842 (62.7)45 (67.2)24 (35.8)3 (4.5)6.84.625.02.53.9
Age >mean age (n = 49)47.526 (52)44 (89.8)33 (67.3)9 (18.4)12.75.828.23.65.0
p Value0.0000.2480.0110.0010.0180.0020.0050.9710.0050.039
Symptom duration ⩽mean symptom duration (11 years, n = 80)36.449 (61.3)57 (71.3)35 (43.8)6 (7.5)8.04.325.02.63.8
Symptom duration > mean symptom duration (n = 36)43.119 (52.8)32 (88.9)22 (61.1)6 (16.7)12.16.728.73.85.5
p Value0.0000.4400.0850.1860.1290.0400.0000.6430.0030.001
Patients with ambiguous syndesmophytes (n = 13)44.08 (61.5)13 (100)13 (100)NA14.95.745.53.44.7
Patients without any ambiguous syndesmophytes (n = 103)37.960 (58.3)77 (74.8)45 (43.7)NA8.75.024.42.94.3
p Value0.0180.5280.0400.000NA0.0010.3780.1050.2180.559