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Table 1 Demographic, biochemical and clinical data. N (%) if not otherwise stated

From: Differences in topographical location of sacroiliac joint MRI lesions in patients with early axial spondyloarthritis and mechanical back pain

  axSpA (n = 25) MBP (n = 59)
Male gender 15 (60%)* 19 (32%)
Age (years), mean (SD) 31.6 (5.7) 32.3 (5.8)
HLA-B27 positivity 18 (72%)* 11 (19%)
BMI (kg/m2), mean (SD) 26.4 (4.2) 26.5 (4.4)a
Childbirths (number), mean (SD) if female (n = 50) 1.6 (1.1) 1.7 (1.2)
Time since last childbirth (years), mean (SD) (n = 40) 5.3 (4.2) 4.0 (4.2)
Fulfilment of the 2009 ASAS criteria [3] 24 (96%)* 36 (61%)
Sacroiliitis according to the 2009 ASAS criteria [4] 24 (96%) 49 (83%)
Inflammatory back pain (ASAS definition [3]) 20 (80%)* 30 (51%)
Buttock pain 23 (92%)* 41 (69%)
  1. ASAS Assessment of SpondyloArthritis International Society, axSpA axial spondyloarthritis, BMI body mass index, HLA-B27 human leucocyte antigen subtype B27, N number, SD standard deviation
  2. *p < 0.05 for test for between-group differences
  3. an = 57