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Risk factors in the illness-death model: Simulation study and the partial differential equation about incidence and prevalence

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  • Annika Hoyer
  • Sophie Kaufmann
  • Ralph Brinks

Abstract

Recently, we developed a partial differential equation (PDE) that relates the age-specific prevalence of a chronic disease with the age-specific incidence and mortality rates in the illness-death model (IDM). With a view to planning population-wide interventions, the question arises how prevalence can be calculated if the distribution of a risk-factor in the population shifts. To study the impact of such possible interventions, it is important to deal with the resulting changes of risk-factors that affect the rates in the IDM. The aim of this work is to show how the PDE can be used to study such effects on the age-specific prevalence of a chronic disease, to demonstrate its applicability and to compare the results to a discrete event simulation (DES), a frequently used simulation technique. This is done for the first time based on the PDE which only needs data on population-wide epidemiological indices and is related to the von Foerster equation. In a simulation study, we analyse the effect of a hypothetical intervention against type 2 diabetes. We compare the age-specific prevalence obtained from a DES with the results predicted from modifying the rates in the PDE. The DES is based on 10000 subjects and estimates the effect of changes in the distributions of risk-factors. With respect to the PDE, the change of the distribution of risk factors is synthesized to an effective rate that can be used directly in the PDE. Both methods, DES and effective rate method (ERM) are capable of predicting the impact of the hypothetical intervention. The age-specific prevalences resulting from the DES and the ERM are consistent. Although DES is common in simulating effects of hypothetical interventions, the ERM is a suitable alternative. ERM fits well into the analytical theory of the IDM and the related PDE and comes with less computational effort.

Suggested Citation

  • Annika Hoyer & Sophie Kaufmann & Ralph Brinks, 2019. "Risk factors in the illness-death model: Simulation study and the partial differential equation about incidence and prevalence," PLOS ONE, Public Library of Science, vol. 14(12), pages 1-10, December.
    • Handle: RePEc:plo:pone00:0226554
    DOI: 10.1371/journal.pone.0226554
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    References listed on IDEAS

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    1. Ralph Brinks & Sandra Landwehr & Rebecca Fischer-Betz & Matthias Schneider & Guido Giani, 2014. "Lexis Diagram and Illness-Death Model: Simulating Populations in Chronic Disease Epidemiology," PLOS ONE, Public Library of Science, vol. 9(9), pages 1-8, September.
    2. Alan Brennan & Stephen E. Chick & Ruth Davies, 2006. "A taxonomy of model structures for economic evaluation of health technologies," Health Economics, John Wiley & Sons, Ltd., vol. 15(12), pages 1295-1310, December.
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