Study designs of evaluations included in the review
Randomised controlled trials (RCTs) on the efficacy of warfarin sodium in the primary prevention of stroke in chronic non-valvular atrial fibrillation were included.
Specific interventions included in the review
The specific intervention was anticoagulation, i.e. warfarin sodium.
Participants included in the review
Patients with chronic non-valvular atrial fibrillation were included.
Outcomes assessed in the review
Fatal stroke, major stroke, fatal intracerebral haemorrhage and major bleed were assessed.
How were decisions on the relevance of primary studies made?
The authors do not state how the papers were selected for the review, or how many of the authors performed the selection.