Recall bias in epidemiologic studies.

Area of Science:

• Epidemiology
• Biostatistics

Background:

• Differential recall between cases and controls is a significant source of bias in retrospective studies.
• Factors influencing recall accuracy and bias are not well understood.
• Distinguishing between inaccurate recall and biased recall is crucial.

Purpose of the Study:

• To review the literature on factors contributing to recall bias in retrospective studies.
• To identify characteristics of exposures and respondents associated with recall accuracy.
• To highlight the role of investigative techniques in mitigating recall bias.

Main Methods:

• Literature review of studies on recall accuracy and bias.
• Analysis of factors influencing recall, including exposure characteristics, respondent traits, and interviewing techniques.
• Examination of validation studies to assess recall bias likelihood.

Main Results:

• Recall bias is influenced by exposure characteristics and respondent attributes.
• Interviewing techniques, questionnaire design, and respondent motivation are key factors controlled by investigators.
• Poor general recall appears to correlate with a higher likelihood of recall bias.

Conclusions:

• Investigator-controlled factors like interviewing techniques are central to managing recall bias.
• Understanding respondent and exposure characteristics is vital for assessing recall accuracy.
• Further research is needed to fully elucidate the mechanisms and mitigation strategies for recall bias.