Intervention bias

Intervention biases are a broad category of biases that result from systematic differences in the way in which the intervention was carried out between groups, or differences in how subjects were exposed to variable of interest.

Also known as exposure bias.

There are a number of different types of intervention bias:

• Co-intervention bias
• Contamination bias
• Timing bias
• Attrition bias
• Proficiency bias

This post is part of a series of posts on bias in medical research. You can find the whole bias catalogue here.

You can find more evidence based medicine resources here.

References

Krishna R et al. Research bias: A review for medical students. Journal of Clinical and Diagnostic Research. 2010; 4:2320-2324.

Sackett DL. Bias in analytic research. Journal of chronic diseases. 1979; 32(1-2):51-63. PMID: 447779