Confounding and the Need for Controls

Confounding and the Need for Controls

Definition of Confounding

• Occurs when a factor associated with an intervention affects the outcome independently of that intervention.

Impact of Confounding

• Can "mask" or muddle the true impact of an intervention.

Importance of Control Groups

• Provide comparison between patients who receive an intervention and those who do not.

• Isolate the impact of the intervention on patient outcomes from extraneous factors.

Characteristics of Control Groups

• Should closely resemble the intervention group in composition.

• Managed similarly to minimize differences other than intervention received.

Types of Control in Clinical Trials

• May receive (CNP):

  • Current standard of care.

  • No intervention.

  • Placebo.