Characterization of Patients With Ankylosing Spondylitis and Nonradiographic Axial Spondyloarthritis in the US-Based Corrona Registry.

Although patients with nonradiographic axial SpA were younger and showed a trend toward a shorter symptom duration, the nonradiographic axial SpA and AS groups shared a similar disease burden, as reflected by comparisons of disease activity and function, quality of life, pain, fatigue, job absenteeism, and loss of work productivity (all P > 0.05).

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