Sex differential impact of comorbidities in spondyloarthritis: data from COMOSPA study.

Objectives: To describe and compare the prevalence of comorbidities in female and male patients with spondyloarthritis (SpA) and to assess whether comorbidities had a different impact on disease outcomes in male and female patients.

Methods: This is a post hoc analysis of the COMOrbidities in SPondyloArthritis study. Differences in comorbidities regarding sex were assessed using logistic regression models.

Association between HLA-B27 and peripheral spondyloarthritis phenotype: results from the ASAS perSpA study.

Objective: To analyse the influence of HLA-B27 in the phenotypical expression of peripheral spondyloarthritis (pSpA).

Method: This is an observational cross-sectional study using data from the Assessment of SpondyloArthritis international Society perSpA registry, including all patients with an available HLA-B27 test result and with a diagnosis of pSpA or psoriatic arthritis (PsA) as per rheumatologist's judgement. Demographic and clinical data, presence of extra musculoskeletal manifestations (EMM) and fibromyalgia were the variables included in a simple and multiple logistic regression model to assess their association to HLA-B27 positivity.