Skip to main content

Table 1 Baseline characteristics and SpA features of chronic back pain patients included in the SPACE cohort (n = 719)

From: Are gender-specific approaches needed in diagnosing early axial spondyloarthritis? Data from the SPondyloArthritis Caught Early cohort

Characteristic

Value

Male gender, n (%)

275 (38)

Age at CBP onset (years), mean (SD)

29.0 (8.0)

Duration of CBP (months), mean (SD)

13.2 (6.9)

Alternating buttock pain, n (%) (N = 454a)

225 (55)

IBP, n (%)

499 (70)

Response to NSAIDs, n (%)

316 (45)

Family history of SpA, n (%)

305 (43)

Peripheral arthritis, n (%)

111 (15)

Heel enthesitis, n (%)

142 (20)

Dactylitis, n (%)

39 (5)

Uveitis, n (%)

58 (8)

Psoriasis, n (%)

88 (12)

IBD, n (%)

48 (6)

HLA-B27+, n (%)

315 (44)

Elevated CRP/ESR, n (%)

217 (30)

MRI-SIJ+, n (%)

234 (32)

X-SIJ+, n (%)

91 (12)

Any positive imaging,b n (%)

250 (34)

  1. SpA spondyloarthritis, SPACE SPondyloArthritis Caught Early, CBP chronic back pain, IBP inflammatory back pain, NSAID non-steroidal anti-inflammatory drug, IBD inflammatory bowel disease, HLA human leukocyte antigen, CRP C-reactive protein, ESR erythrocyte sedimentation rate, MRI-SIJ magnetic resonance imaging of sacroiliac joints, X-SIJ plain radiograph of sacroiliac joints
  2. aMissing data < 5% unless otherwise indicated
  3. bMRI-SIJ+ and/or X-SIJ+