Table 2

Factors and covariates associated with a diagnosis of specific EAM in patients with axSpA (multivariable models)

ParameterBSEP valueIncidence rate ratio
(IRR)
95% CI for IRR
A. Diagnosis of AUU
(Intercept)−2.3700.2788<0.0010.0930.054–0.161
HLA-B27 positive (vs negative)0.6690.1710<0.0011.9531.396–2.730
University degree (vs lower)0.1650.15070.2731.1790.878–1.585
Ever-smoking (vs never)−0.3490.13220.0080.7060.545–0.915
Age (years)0.0090.00530.0931.0090.999–1.019
axSpA disease duration (years)0.0050.00500.3051.0050.995–1.015
B. Diagnosis of Psoriasis
(Intercept)−3.0690.5920.0000.0460.015–0.148
HLA-B27 positive (vs negative)−0.6210.1970.0020.5380.365–0.791
University degree (vs lower)0.3260.2830.2481.3860.796–2.412
Ever-smoking (vs never)0.2560.2280.2621.2920.826–2.020
Age (years)0.0090.0070.1731.0090.996–1.022
BMI (kg/m2)0.0220.0160.1551.0230.992–1.05
C. Diagnosis of IBD
(Intercept)−2.6980.3617<0.0010.0670.033–0.137
HLA-B27 positive (vs negative)−0.4660.18940.0140.6270.433–0.909
Age (years)0.0120.00790.1281.0120.997–1.028
axSpA disease duration (years)0.0030.00780.6711.0030.988–1.019
  • AAU, acute anterior uveitis; axSpA, axial spondyloarthritis; BMI, body mass index; EAM, extra-articular manifestation; HLA, human leukocyte antigen; IBD, inflammatory bowel disease.