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. 2006 Sep;65(9):1251–1252. doi: 10.1136/ard.2005.051045

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Figure 1 Dependency of the post‐test probability of axial spondyloarthritis (SpA) on the resulting likelihood ratio (LR) product for an assumed pretest probability of 5% (according to Underwood and Dawes2). This probability curve is meant to be applied in patients with chronic back pain suspected to have axial SpA.