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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