Table 5.

Odds ratios (OR) of relevant items for a diagnosis of axial SpA: results of logistic regression analysis

	AS	Non-radiographic axial SpA	Axial SpA
Age ≤35 years	2.5 (p=0.03)	2.8 (p=0.03)	2.6 (95% CI 1.5 to 4.5) (p=0.0009)
Alternating buttock pain	3.3 (p=0.005)	2.0 (p=0.1)	2.7 (95% CI 1.4 to 5.5) (p=0.003)
Improvement by NSAIDs within 48 h or no NSAID	2.9 (p=0.01)	NS	1.2 (95% CI 0.7 to 2.2) (p=0.004)
Waking up in the second half of the night	3.0 (p=0.005)	NS	1.9 (95% CI 1.1 to 3.2) (p=0.001)
Improvement by movement not by rest	2.0 (p=0.1)	1.9 (p=0.07)	1.9 (95% CI 1.0 to 3.4) (p=0.03)
History of psoriasis	NS	3.6 (p=0.02)	2.1 (95% CI 0.7 to 6.4) (p=0.2)
History of enthesitis	NS	2.7 (p=0.03)	2.3 (95% CI 1.0 to 5.1) (p=0.06)
History of anterior uveitis	7.2 (p=0.07)	NS	3.6 (95% CI 0.5 to 25.3) (p=0.2)
History of arthritis	3.4 (p=0.079	2.5 (p=0.1)	2.6 (95% CI 0.9 to 7.1) (p=0.06)
Family history of SpA	NS	2.5 (p=0.1)	2.3 (95% CI 0.8 to 6.6) (p=0.1)

AS, ankylosing spondylitis; NS, not significant; NSAID, non-steroidal anti-inflammatory agent; SpA, spondyloarthritis.