BACKGROUND: Patients grouped together in practices may share characteristics that cause them to have similar responses to an intervention. Sampling from such groups means that the power of a trial is less than when subjects are selected from the population at random. Knowledge of likely variation in outcome at the practice level is necessary to calculate the extent to which sample size would need to be inflated to maintain statistical power in the face of 'cluster effects'. OBJECTIVES: To pla...Expand abstract
- Publication status:
- Publisher copy:
- Copyright date:
Design and analysis of studies evaluating smoking cessation interventions where effects vary between practices or practitioners.
Views and Downloads
If you are the owner of this record, you can report an update to it here: Report update to this record