Table 2

Multivariable logistic regression of parameters potentially contributory to the classification of spondyloarthritis (SpA) in patients with peripheral arthritis, enthesitis, or dactylitis (n=266)

All patients
OR (95% CI)p Value
Male gender1.09 (0.54 to 2.20)0.80
Age (per year increase in age)0.96 (0.93 to 0.99)0.034
Peripheral arthritis, ever1.04 (0.31 to 3.55)0.94
Enthesitis at any site, ever5.61 (2.66 to 11.82)<0.001
Dactylitis, ever0.93 (0.39 to 2.23)0.87
Uveitis, ever2.62 (0.17 to 39.90)0.49
Psoriasis, ever12.20 (2.25 to 66.00)0.004
Preceding infection3.86 (0.83 to 17.97)0.085
IBP* in the past2.12 (0.85 to 5.35)0.11
Family history for SpA (ankylosing spondylitis, reactive arthritis, uveitis, psoriasis, IBD)3.54 (1.24 to 10.12)0.018
HLA-B2713.72 (4.69 to 40.58)<0.001
Definite radiographic sacroiliitis (≥grade 2 bilateral or ≥grade 3 unilateral)13.10 (2.52 to 68.10)0.002
  • p Values of ≤ 0.05 are considered to be statistically significant. Sacroiliitis on MRI was not entered into the logistic regression analysis because of too few patients (n=60) with available information and because of infinite 95% CI. IBD was removed from the analysis because of infinite 95% CI. The R2 of this logistic regression analysis was 0.513 (Nagelkerke&#x0026;#x0027;s).

  • * IBP according to the rheumatologist&#x0026;#x0027;s judgement.

  • HLA-B27, human leucocyte antigen B27; IBD, inflammatory bowel disease; IBP, inflammatory back pain.