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A Bayesian approach to investigate life course hypotheses involving continuous exposures

BACKGROUND: Different hypotheses have been proposed in life course epidemiology on how a time-varying exposure can affect health or disease later in life. Researchers are often interested in investigating the probability of these hypotheses based on observed life course data. However, current techni...

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Autores principales: Madathil, Sreenath, Joseph, Lawrence, Hardy, Rebecca, Rousseau, Marie-Claude, Nicolau, Belinda
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6208282/
https://www.ncbi.nlm.nih.gov/pubmed/29912384
http://dx.doi.org/10.1093/ije/dyy107
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author Madathil, Sreenath
Joseph, Lawrence
Hardy, Rebecca
Rousseau, Marie-Claude
Nicolau, Belinda
author_facet Madathil, Sreenath
Joseph, Lawrence
Hardy, Rebecca
Rousseau, Marie-Claude
Nicolau, Belinda
author_sort Madathil, Sreenath
collection PubMed
description BACKGROUND: Different hypotheses have been proposed in life course epidemiology on how a time-varying exposure can affect health or disease later in life. Researchers are often interested in investigating the probability of these hypotheses based on observed life course data. However, current techniques based on model/variable selection do not provide a direct estimate of this probability. We propose an alternative technique for a continuous exposure, using a Bayesian approach that has specific advantages, to investigate which life course hypotheses are supported by the observed data. METHODS: We demonstrate the technique, the relevant life course exposure model (RLM), using simulations. We also analyse data from a case-control study on risk factors of oral cancer, with repeated measurements of betel quid chewing across life. We investigate the relative importance of chewing one quid of betel per day, at three life periods: ≤20 years, 21–40 years and above 40 years of age, on the risk of developing oral cancer. RESULTS: RLM was able to correctly identify the life course hypothesis under which the data were simulated. Results from the case-control study showed that there was 74.3% probability that betel quid exposure earlier in life, compared with later, results in higher odds of developing oral cancer later in life. CONCLUSIONS: RLM is a useful option to identify the life course hypothesis supported by the observed data prior to the estimation of a causal effect.
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spelling pubmed-62082822018-11-05 A Bayesian approach to investigate life course hypotheses involving continuous exposures Madathil, Sreenath Joseph, Lawrence Hardy, Rebecca Rousseau, Marie-Claude Nicolau, Belinda Int J Epidemiol Methods BACKGROUND: Different hypotheses have been proposed in life course epidemiology on how a time-varying exposure can affect health or disease later in life. Researchers are often interested in investigating the probability of these hypotheses based on observed life course data. However, current techniques based on model/variable selection do not provide a direct estimate of this probability. We propose an alternative technique for a continuous exposure, using a Bayesian approach that has specific advantages, to investigate which life course hypotheses are supported by the observed data. METHODS: We demonstrate the technique, the relevant life course exposure model (RLM), using simulations. We also analyse data from a case-control study on risk factors of oral cancer, with repeated measurements of betel quid chewing across life. We investigate the relative importance of chewing one quid of betel per day, at three life periods: ≤20 years, 21–40 years and above 40 years of age, on the risk of developing oral cancer. RESULTS: RLM was able to correctly identify the life course hypothesis under which the data were simulated. Results from the case-control study showed that there was 74.3% probability that betel quid exposure earlier in life, compared with later, results in higher odds of developing oral cancer later in life. CONCLUSIONS: RLM is a useful option to identify the life course hypothesis supported by the observed data prior to the estimation of a causal effect. Oxford University Press 2018-10 2018-06-14 /pmc/articles/PMC6208282/ /pubmed/29912384 http://dx.doi.org/10.1093/ije/dyy107 Text en © The Author(s) 2018. Published by Oxford University Press on behalf of the International Epidemiological Association. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Methods
Madathil, Sreenath
Joseph, Lawrence
Hardy, Rebecca
Rousseau, Marie-Claude
Nicolau, Belinda
A Bayesian approach to investigate life course hypotheses involving continuous exposures
title A Bayesian approach to investigate life course hypotheses involving continuous exposures
title_full A Bayesian approach to investigate life course hypotheses involving continuous exposures
title_fullStr A Bayesian approach to investigate life course hypotheses involving continuous exposures
title_full_unstemmed A Bayesian approach to investigate life course hypotheses involving continuous exposures
title_short A Bayesian approach to investigate life course hypotheses involving continuous exposures
title_sort bayesian approach to investigate life course hypotheses involving continuous exposures
topic Methods
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6208282/
https://www.ncbi.nlm.nih.gov/pubmed/29912384
http://dx.doi.org/10.1093/ije/dyy107
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