Gout and the risk of advanced chronic kidney disease in the UK health system: a national cohort study

ObjectiveEvaluate the association between gout and risk of advanced chronic kidney disease (CKD).DesignRetrospective matched cohort study.SettingUK Clinical Practice Research Datalink.ParticipantsThe analysis included data for 68 897 patients with gout and 554 964 matched patients without gout. Patients were aged ≥18 years, registered at UK practices, had ≥12 months of clinical data and had data linked with Hospital Episode Statistics. Patients were excluded for history of advanced CKD, juvenile gout, cancer, HIV, tumour lysis syndrome, Lesch-Nyhan syndrome or familial Mediterranean fever.Primary and secondary outcome measuresAdvanced CKD was defined as first occurrence of: (1) dialysis, kidney transplant, diagnosis of end-stage kidney disease (ESKD) or stage 5 CKD (diagnostic codes in Read system or International Classification of Diseases, Tenth Revision); (2) estimated glomerular filtration rate (eGFR)