Influence of the age at diagnosis in the disease expression of primary Sjögren's syndrome. Analysis of 12,753 patients from the Sjögren Big Data Consortium
Objective. To analyse how the main components of the disease phenotype (sicca symptoms, diagnostic tests, immunological markers and systemic disease) can be driven by the age at diagnosis of primary Sjögren's syndrome (pSS). Methods. By January 2021, the participant centres had included 12,753 patients from 25 countries that fulfilled the 2002/2016 classification criteria for pSS. The age at diagn