Basic statistics for clinicians: 3. Assessing the effects of treatment: measures of association.

  title={Basic statistics for clinicians: 3. Assessing the effects of treatment: measures of association.},
  author={Roman C Jaeschke and Gordon H. Guyatt and Harriet Shannon and Sabine Walter and Deborah J Cook and N Heddle},
  journal={CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne},
  volume={152 3},
In the third of a series of four articles the authors show the calculation of measures of association and discuss their usefulness in clinical decision making. From the rates of death or other "events" in experimental and control groups in a clinical trial, we can calculate the relative risk (RR) of the event after the experimental treatment, expressed as a percentage of the risk without such treatment. The absolute risk reduction (ARR) is the difference in the risk of an event between the… CONTINUE READING

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