BAY59-7939 in Atrial Fibrillation Once Daily (OD)

Inclusion Criteria: Japanese subjects with non-valvular AF who met all of the following criteria: * Male subjects aged 20 years or older and postmenopausal female subjects * Subjects with persistent or paroxysmal non-valvular AF with \>/=2 episodes before enrollment, at least 1 of which had been verified by ECG recording within 4 weeks before randomization * Subjects who were at risk for stroke as follows: * Subjects with at least one risk factor for thromboembolism (hypertension, diabetes mellitus, coronary artery disease, congestive heart failure). * Subjects aged 60 years old and above regardless of the existence of above risk factors. Exclusion Criteria: * History or presence of stroke or transient ischemic attack. * History of intracerebral hemorrhage. * History or presence of bleeding at randomization; intraocular or gastrointestinal bleeding within the last 6 months prior to randomization.