Table 1

Comparative baseline characteristics of patients with non-radiographic axial SpA and AS with high (index of NSAID intake ≥50) and low (index of NSAID intake <50) NSAIDs intake

Parameters at baselineLow NSAIDs intake (NSAIDS index<50)High NSAIDs intake (NSAIDS index≥50)
AS (n=88)n6424
Age, years36.2±12.438.7±9.8
Symptoms duration, years5.0±2.95.5±2.7
Male sex, %6767
HLA-B27 (+), %8679
CRP, mg/l11.7±12.37.9±8.7
ESR, mm/h21.7±19.615.8±9.2
mSASSS, units5.7±11.66.7±7.7
Syndesmophytes, %2746
Smoking, %3938
Non-radiographic axial SpA (n=76)n5719
Age, years38.6 ±9.343.0±9.6
Symptoms duration, years3.0±2.23.7±2.1
Male sex, %3232
HLA-B27 (+), %7168
CRP, mg/l6.2±14.46.2±7.0
ESR, mm/h12.1±9.113.4±8.8
mSASSS, units2.6±4.81.6±4.0
Syndesmophytes, %1411
Smoking, %3226
  • * p<0.05; † p<0.01 for the difference between two groups.

  • AS, ankylosing spondylitis; BASDAI, the Bath Ankylosing Spondylitis Disease Activity Index; BASFI, the Bath Ankylosing Spondylitis Functional Index; CRP, C reactive protein; ESR, erythrocyte sedimentation rate; HLA, human leucocyte antigen; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; NSAID, non-steroidal anti-inflammatory drug; SpA, spondyloarthritis.