Demographic data of 363 probands with axial spondyloarthritis by HLA-B27 status and presence of sacroiliitis by New York criteria
HLA-B27 status unknown for 5 probands, including one without sacroiliitis by modified New York criteria
Including 3 probands for whom a pelvic radiograph was not available
AxSpA probands who meet modified New York criteria are categorized as ankylosing spondylitis (AS), probands who do not fulfill the New York criteria for sacroiliitis are considered having non-radiographic axial SpA (axSpA).
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