Suggested answer to exercise: Evaluation of a nurse-run asthma school, 4

Question 4: What bias, if any, might there be in the patientsí response concerning the use of a PEF-meter?

Suggested answer

The assessment of PEF-meter use is by patients' own reports. The patients know what the researchers want to hear, because the Asthma School has told them. Thus they may report using the PEF-meter, for example, because they think they should, not because they actually do it. This would be response bias.

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Last updated: 20 October, 2006.

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