Controlling for time-dependent confounding using marginal structural models

Longitudinal studies in which exposures, confounders, and outcomes are measured repeatedly over time have the potential to allow causal inferences about the effects of exposure on outcome. There is particular interest in estimating the causal effects of medical treatments (or other interventions) in circumstances in which a randomized controlled trial is difficult or impossible. However, standard methods for estimating exposure effects in longitudinal studies are biased in the presence of time-dependent confounders affected by prior treatment. This article describes the use of marginal structural models (described by Robins, Hernán, and Brumback [2000]) to estimate exposure or treatment effects in the presence of time-dependent confounders affected by prior treatment. The method is based on deriving inverse-probability-of-treatment weights, which are then used in a pooled logistic regression model to estimate the causal effect of treatment on outcome. We demonstrate the use of marginal structural models to estimate the effect of methotrexate on mortality in persons suffering from rheumatoid arthritis.


Issue Date:
2004
Publication Type:
Journal Article
DOI and Other Identifiers:
st0075 (Other)
PURL Identifier:
http://purl.umn.edu/116267
Published in:
Stata Journal, Volume 04, Number 4
Page range:
402-420
Total Pages:
19

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 Record created 2017-04-01, last modified 2017-11-17

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