For more information regarding Bristol-Myers Squibb Clinical Trial participation, please visit www.BMSStudyConnect.com.  Inclusion Criteria:  Individuals ≥ 20 years old as of the index date At least 1 diagnosis of NVAF during index date, identified by any medical record  Exclusion Criteria:  Had no data of serum creatinine in the patient's medical records Had no data of body weight in the patient's medical records Were given OAC for treatment of diseases other than AF