Cluster randomised controlled trial of screening for atrial fibrillation in people aged 70 years and over to reduce stroke: protocol for the pilot study for the safer trial

HIGHLIGHTS

• who: Kate Williams and colleagues from the score, and prevalence of AF reported in the Quality and Outcomes FrameworkNo recruitment will take place in a practice once randomisation has occurred. Randomisation will be implemented using a secure online randomisation system (Sortition53) hosted by the University of Oxford Clinical Trials Unit. Practices will be randomised using random permuted blocks within nine strata corresponding to three groups (tertiles) of practice location deprivation score and three groups (tertiles) of practice-u00adlevel prevalence of AF. The block sizes will be known only to the trial statistician and the randomisation system programmer . . .
  

   

  

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