Evidence map›Paper›PMID 32554901›Full record

ArticlePhysical biology2020

Why case fatality ratios can be misleading: individual- and population-based mortality estimates and factors influencing them.

Lucas Böttcher, Mingtao Xia, Tom Chou

Abstract read
In one paragraph

Article in Physical biology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

16 citing papers in PubMed.

  1. Article
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  6. A statistical model of COVID-19 testing in populations: effects of sampling bias andtesting errors.Philosophical transactions. Series A, Mathematical, physical, and engineering sciences · 2022
    Article
  7. Article
  8. Decisive Conditions for Strategic Vaccination against SARS-CoV-2.medRxiv : the preprint server for health sciences · 2021
    Article
  9. Article
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  11. Article
  12. Article
  13. Article
  14. Article
  15. Global prediction of unreported SARS-CoV2 infection from observed COVID-19 cases.medRxiv : the preprint server for health sciences · 2020
    Article
  16. Review
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors.

Lucas BöttcherDept. of Computational Medicine, UCLA, Los Angeles, CA 90095-1766, United States of America.ORCID 0000-0003-1700-1897
Mingtao XiaDept. of Mathematics, UCLA, Los Angeles, CA 90095-1555, United States of America.
Tom ChouDept. of Computational Medicine, UCLA, Los Angeles, CA 90095-1766, United States of America.ORCID 0000-0003-0785-6349

Funding

Tracking clonal dynamics during hematopoiesis: mechanistic insight via modeling and data analysisR01HL146552 · NHLBI · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI CHOU, TOM · 2019 to 2022
$907k
NHLBI NIH HHS R01 HL146552
6 · The paper itself

Abstract

Different ways of calculating mortality during epidemics have yielded very different results, particularly during the current COVID-19 pandemic. For example, the 'CFR' has been interchangeably called the case fatality ratio, case fatality rate, and case fatality risk, often without standard mathematical definitions. The most commonly used CFR is the case fatality ratio, typically constructed using the estimated number of deaths to date divided by the estimated total number of confirmed infected cases to date. How does this CFR relate to an infected individual's probability of death? To explore such issues, we formulate both a survival probability model and an associated infection duration-dependent SIR model to define individual- and population-based estimates of dynamic mortality measures to show that neither of these are directly represented by the case fatality ratio. The key parameters that affect the dynamics of different mortality estimates are the incubation period and the time individuals were infected before confirmation of infection. Using data on the recent SARS-CoV-2 outbreaks, we estimate and compare the different dynamic mortality estimates and highlight their differences. Informed by our modeling, we propose more systematic methods to determine mortality during epidemic outbreaks and discuss sensitivity to confounding effects and uncertainties in the data arising from, e.g., undertesting and heterogeneous populations.

Indexed as

COVID-19HumansModels, StatisticalPandemicsProbabilitySARS-CoV-2Uncertainty

Identifiers

PMID32554901
PMCPMC8849595

What OpenQuestion holds

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LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.