We examined the whole history of patients with any stroke codes recorded in the CPRD and included patients aged at least 18 years with a diagnosis of first stroke between 1 January 2000 and 31 December 2014. The study population comprises patients registered with participating general practices, including nursing home patients. Patients with any Read codes relating to hemorrhagic stroke for the index stroke were excluded. To ensure the quality of recording of pre-existing diagnoses and medications, eligible patients were also required to have at least 12-month record information before the index date. Codes for stroke were listed in Table S1.
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