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Demographic and disease characteristics of patients in whom an SI-MRI was ordered
In univariable analysis, male gender, the number of symptoms at presentation, short disease duration, chronic back pain, IBP, enthesitis, no history of arthritis, no history of psoriasis, lower CRP, ESR and ASDAS-CRP were associated with a request for SI-MRI.
In multivariable analysis, factors remaining independently associated with ordering SI-MRI were IBP (OR = 1.81, CI 95% [1.13–2.90], p = 0.01), enthesitis (OR = 1.57, CI 95% [1.00–2.49], p = 0.04) and the number of symptoms at presentation (OR = 1.27 per additional symptom, CI 95% [1.10–1.47], p < 0.001). Results are shown in Tables 1-2.
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