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September 17, 2026Epidemiology

Indirect Estimation of the Number of Prevalent Cases – Relaxing the Steady State Assumption

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Authors

WFW. Dana FlandersMGMichael GoodmanCLCathy Lally

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Overview

Methodological study demonstrates accurate indirect estimation of disease prevalence under non-steady-state conditions, indicating reliable disease burden estimates when incidence changes linearly.

Key Points

  • To develop and evaluate an indirect mathematical formula for estimating prevalent disease cases that removes the need for a steady-state assumption.
  • Formulated an alternative mathematical equation combining prevalent cases, temporal incident cases, average disease duration, and mean square disease duration.
  • Evaluated the mathematical formula through illustrative examples testing sensitivity to the number of time intervals used to capture linear incidence trends.
  • Demonstrated that indirect prevalence estimation is valid without assuming steady state, provided incidence case shifts over time remain approximately linear.
  • Observed that indirect prevalence estimates remain robust regardless of the specific number of time intervals evaluated to identify linear trends.

Cite This Study

Flanders et al. (2026) studied this question.

synapsesocial.com/papers/6aabb73d5f706d05830e61d5https://doi.org/10.1097/ede.0000000000002049
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