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Effect decomposition in the presence of an exposure-induced mediator-outcome confounder

(2014) EPIDEMIOLOGY. 25(2). p.300-306
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Abstract
Methods from causal mediation analysis have generalized the traditional approach to direct and indirect effects in the epidemiologic and social science literature by allowing for interaction and nonlinearities. However, the methods from the causal inference literature have themselves been subject to a major limitation, in that the so-called natural direct and indirect effects that are used are not identified from data whenever there is a mediator-outcome confounder that is also affected by the exposure. In this article, we describe three alternative approaches to effect decomposition that give quantities that can be interpreted as direct and indirect effects and that can be identified from data even in the presence of an exposure-induced mediator-outcome confounder. We describe a simple weighting-based estimation method for each of these three approaches, illustrated with data from perinatal epidemiology. The methods described here can shed insight into pathways and questions of mediation even when an exposure-induced mediator-outcome confounder is present.
Keywords
MORTALITY, MODELS, ASSUMPTIONS, CAUSAL INFERENCE, SENSITIVITY-ANALYSIS

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Chicago
VanderWeele, Tyler J, Stijn Vansteelandt, and James M Robins. 2014. “Effect Decomposition in the Presence of an Exposure-induced Mediator-outcome Confounder.” Epidemiology 25 (2): 300–306.
APA
VanderWeele, T. J., Vansteelandt, S., & Robins, J. M. (2014). Effect decomposition in the presence of an exposure-induced mediator-outcome confounder. EPIDEMIOLOGY, 25(2), 300–306.
Vancouver
1.
VanderWeele TJ, Vansteelandt S, Robins JM. Effect decomposition in the presence of an exposure-induced mediator-outcome confounder. EPIDEMIOLOGY. 2014;25(2):300–6.
MLA
VanderWeele, Tyler J, Stijn Vansteelandt, and James M Robins. “Effect Decomposition in the Presence of an Exposure-induced Mediator-outcome Confounder.” EPIDEMIOLOGY 25.2 (2014): 300–306. Print.
@article{5765162,
  abstract     = {Methods from causal mediation analysis have generalized the traditional approach to direct and indirect effects in the epidemiologic and social science literature by allowing for interaction and nonlinearities. However, the methods from the causal inference literature have themselves been subject to a major limitation, in that the so-called natural direct and indirect effects that are used are not identified from data whenever there is a mediator-outcome confounder that is also affected by the exposure. In this article, we describe three alternative approaches to effect decomposition that give quantities that can be interpreted as direct and indirect effects and that can be identified from data even in the presence of an exposure-induced mediator-outcome confounder. We describe a simple weighting-based estimation method for each of these three approaches, illustrated with data from perinatal epidemiology. The methods described here can shed insight into pathways and questions of mediation even when an exposure-induced mediator-outcome confounder is present.},
  author       = {VanderWeele, Tyler J and Vansteelandt, Stijn and Robins, James M},
  issn         = {1044-3983},
  journal      = {EPIDEMIOLOGY},
  language     = {eng},
  number       = {2},
  pages        = {300--306},
  title        = {Effect decomposition in the presence of an exposure-induced mediator-outcome confounder},
  url          = {http://dx.doi.org/10.1097/EDE.0000000000000034},
  volume       = {25},
  year         = {2014},
}

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