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. 2011 Aug 5;70(10):1782–1787. doi: 10.1136/ard.2011.151167

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Criteria for the recognition of axial SpA. Age at onset ≤35 years; wakening up in the second half of the night; alternating buttock pain; improvement by NSAIDs within 48 h or no NSAID; improvement by movement, not rest.

The sensitivities and specificities for ≥4 criteria were 47.8 and 86.1%, for ≥3 criteria 78.8 and 46.4%, and ≥2 criteria 96.5 and 17.0%, respectively.NSAID non-steroidal anti-inflammatory drug; SpA, axial spondyloarthritis.