title: A serial risk score approach to disease classification that accounts for accuracy and cost.
abstract: The performance of diagnostic tests for disease classification is often measured by accuracy (e.g., sensitivity or specificity); however, costs of the diagnostic test are a concern as well. Combinations of multiple diagnostic tests may improve accuracy, but incur additional costs. Here, we consider serial testing approaches that maintain accuracy while controlling costs of the diagnostic tests. We present a serial risk score classification approach. The basic idea is to sequentially test with additional diagnostic tests just until persons are classified. In this way, it is not necessary to test all persons with all tests. The methods are studied in simulations and compared with logistic regression. We applied the methods to data from HIV cohort studies to identify HIV infected individuals who are recently infected (<1 year) by testing with assays for multiple biomarkers. We find that the serial risk score classification approach can maintain accuracy while achieving a reduction in cost compared to testing all individuals with all assays.
authors.affiliation: Department of Biostatistics, University of California, Los Angeles, California, U.S.A.
authors.forename: Dat
authors.initials: D
authors.lastname: Huynh
authors.forename: Oliver
authors.initials: O
authors.lastname: Laeyendecker
authors.forename: Ron
authors.initials: R
authors.lastname: Brookmeyer
mesh_terms: D000465:Algorithms; D019411:Clinical Laboratory Techniques / Q000191:economics* / Q000706:statistics & numerical data; D015658:HIV Infections / Q000175:diagnosis* / Q000191:economics*; D017048:Health Care Costs / Q000706:statistics & numerical data*; D006801:Humans; D008137:Longitudinal Studies; D015995:Prevalence; D015203:Reproducibility of Results; D018570:Risk Assessment / Q000191:economics / Q000379:methods; D012680:Sensitivity and Specificity
keywords: Biomarkers; Classification; Diagnostic tests; HIV