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Selective screening: when should screening be limited to high-risk individuals?
1Department of Epidemiology, Johns Hopkins University, School of Hygiene and Public Health, Baltimore, MD 21205.
Journal of General Internal Medicine
|September 1, 1990
Summary
Selective screening strategies impact cost and true case detection by balancing test accuracy and program accuracy. Combining risk factors can improve program accuracy and reduce costs if interactions are additive.
Area of Science:
- * Medical screening and diagnostic test evaluation.
- * Public health program assessment and optimization.
- * Health economics and cost-effectiveness analysis.
Background:
- * Selective screening aims to improve efficiency and accuracy in identifying individuals with specific health conditions.
- * Distinguishing between test accuracy (individual level) and program accuracy (population level) is crucial for evaluating screening interventions.
- * Current screening practices may not optimally balance sensitivity, specificity, and cost.
Purpose of the Study:
- * To analyze the implications of selective screening strategies on cost-effectiveness and true case detection.
- * To differentiate between test accuracy and program accuracy in the context of screening programs.
- * To investigate the impact of combining risk factors on screening program outcomes.
Main Methods:
- * Conceptual analysis of test accuracy versus program accuracy metrics.
- * Examination of cost-effectiveness and true case detection in relation to specificity and sensitivity trade-offs.
- * Modeling the effect of additive interactions between multiple risk factors on screening outcomes.
- * Critical review of criteria for determining screening periodicity.
Main Results:
- * Combining risk factors for high-risk subject identification can enhance program accuracy and reduce costs when additive interactions are present.
- * Increased specificity in selective screening may lead to a loss in sensitivity for the overall population.
- * The notion of disease occurrence risk is not a suitable criterion for defining screening periodicity.
Conclusions:
- * Selective screening strategies require careful consideration of the interplay between test accuracy, program accuracy, cost, and detection rates.
- * Combining risk factors with additive interactions offers a promising approach to improve the efficiency of screening programs.
- * Screening periodicity should be determined by factors beyond simple disease occurrence risk to ensure optimal public health impact.