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RESULTS
Patient’s characteristics
The population consisted of 581 patients. Table-1 presents the descriptive characteristics of the cohort in total and split by disease subtype, according to clinical diagnosis (external standard). Overall, 72% of patients were men with mean (SD) age of 35 (13.5) years, symptom duration of 7.3 (9.7) years and age at the beginning of the symptoms of 28 (10.3) years. In total, 76% of patients had a history of -or had current- chronic back pain, and 64% of these had IBP. Seventy-two percent had a history of -or had current- asymmetric oligo-arthritis, and 57% had a history of -or had current- enthesitis. Disease activity was calculated separately for patients with axial or peripheral SpA. Axial-SpA patients had a mean (SD) BASDAI of 5.4 (2.4) an ASDAS-CRP of 2.6 (0.8) and an ASDAS-ESR of 3.0 (0.9). Peripheral-SpA patients had a BASDAI of 5.3 (2.5), an ASDAS-CRP of 2.3 (0.9) and an ASDAS-ESR of 3.0 (0.9).
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