Study to Gather Information to What Extent Patients Follow the Treatment Regimen of Low-dose Aspirin for Primary and Secondary Prevention of Diseases of the Heart and Blood Vessels

Inclusion Criteria

• •Aged ≥18 years
• •Patients will be selected if they have at least two prescriptions for low-dose aspirin (75-100 mg) between 2008 and 2018 for either:
• •* Primary prevention of CVD This is defined as patients who have no history of CVD any time prior to initiation of low-dose aspirin treatment are presumed to use for primary CVD prevention
• •* Secondary prevention of CVD This is defined as patients who have a history of CVD any time prior to initiation of low-dose aspirin treatment
• •Patients with at least two prescriptions of low-dose aspirin with a dosage of 75-100mg within the first year of the index date.
• •Restricted to patients with observation for at least 12 months before and 12 after the index date.