A Real-World Comparison of Safety and Effectiveness of Novel Oral Anti-Coagulant (NOAC) Naïve and Warfarin Naïve Non-Valvular Atrial Fibrillation (NVAF) Patients With Medicare Advantage Coverage

Inclusion Criteria: * Had at least 1 pharmacy claim for warfarin, apixaban, dabigatran, or rivaroxaban during the identification period (01-Jan-2013 through 31-Dec-2015) * Had continuous health plan enrollment with medical and pharmacy benefits for 6 months pre-index date (baseline period) * Had continuous health plan enrollment with medical and pharmacy benefits for at least 1 month following index date * Had at least 1 medical claim for atrial fibrillation any time before or on index date Exclusion Criteria: * Had medical claims with a diagnosis code for rheumatic mitral valvular heart disease, mitral valve stenosis or heart valve replacement/transplant during the 6-month baseline period * Had medical claims with a diagnosis code for dialysis, kidney transplant, or end-stage chronic kidney disease during the 6 month baseline period * Had medical claims indicating a diagnosis of venous thromboembolism during the 6-month baseline period * Had claims indicating a diagnosis or procedure code of hip or knee replacement surgery within 6 weeks prior to the index date * Had claims for a diagnosis or procedure code for reversible atrial fibrillation * Had medical claims indicating pregnancy during the study period * Had a pharmacy claim for warfarin, apixaban, dabigatran, edoxaban, or rivaroxaban during the 6-month baseline period * Had \> 1 oral anticoagulant prescription claim on the index date