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Dual responses to increase validity in case-control studies.

L R Salmi¹, S Wacholder

¹Institut Mérieux, Département d'Epidémiologie et Biostatistique, Lyon, France.

Revue D'Epidemiologie Et De Sante Publique

|January 1, 1990

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This study found that using only concordant responses in case-control studies reduces bias in relative risk estimates. However, this method is inefficient and costly, suggesting series response estimation as a complementary approach, especially for rare exposures.

Area of Science:

Epidemiology
Biostatistics

Background:

Case-control studies are susceptible to measurement error in exposure assessment.
Imperfect measurement tools can introduce bias into study findings.

Purpose of the Study:

To compare methods for increasing the validity of case-control studies with two imperfect exposure measurement tools.
To evaluate bias and efficiency of different estimation strategies.

Main Methods:

Simulated data were used to compare three methods for exposure assessment.
Analysis focused on point estimates of relative risk using concordant and discordant responses.
Series response estimation was explored as an alternative approach.

Main Results:

Estimates using only concordant dual responses showed the least bias.

Related Experiment Videos

Discarding discordant responses led to a loss of statistical power, making the concordant-only design inefficient and expensive.

Series response estimation, using all information but classifying only dual positives as exposed, can supplement less biased estimates.

Conclusions:

Concordant response design offers reduced bias but at the cost of efficiency and increased expense.
Series response estimation provides a valuable, more efficient alternative, particularly when exposure is rare and costly to measure.