Study population:

Age > 75yrs with AF

Comments:

Mean age of patients prescribed warfarin was 81.5 years.
73% of patients had a CHADS2 score of 1-2.
67% of patients on warfarin remained on this treatment for the complete duration of the trial.

 

Outcome Duration NNT Annualised NNT
1st occurrence of fatal or non fatal disabling stroke (ischaemic or haemorrhagic), other  intracranial haemorrhage or clinically significant arterial embolism 2.7 years (mean duration of followup)

20

54

References

Warfarin versus aspirin for stroke prevention in an elderly community population with atrial fibrillation ( the Birmingham Atrial Fibrillation Treatment of the Aged Study, BAFTA) : a randomised controlled trial. Lancet 2007; 370: 493 - 503.