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    A Proxy Outcome Approach for Causal Effect in Observational Studies: A Simulation Study

    199284_117412_A_Proxy_Outcome_approach.pdf (1.342Mb)
    Access Status
    Open access
    Authors
    Liang, Wenbin
    Zhao, Y.
    Lee, Andy
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Liang, W. and Zhao, Y. and Lee, A. 2014. A Proxy Outcome Approach for Causal Effect in Observational Studies: A Simulation Study. BioMed Research International. 2014: Article ID 872435.
    Source Title
    BioMed Research International
    DOI
    10.1155/2014/872435
    ISSN
    2314-6133
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/. Please refer to the licence to obtain terms for any further reuse or distribution of this work.

    URI
    http://hdl.handle.net/20.500.11937/42634
    Collection
    • Curtin Research Publications
    Abstract

    Background: Known and unknown/unmeasured risk factors are the main sources of confounding effects in observational studies and can lead to false observations of elevated protective or hazardous effects. In this study, we investigate an alternative approach of analysis that is operated on field-specific knowledge rather than pure statistical assumptions. Method: The proposed approach introduces a proxy outcome into the estimation system. A proxy outcome possesses the following characteristics: (i) the exposure of interest is not a cause for the proxy outcome; (ii) causes of the proxy outcome and the study outcome are subsets of a collection of correlated variables. Based on these two conditions, the confounding-effect-driven association between the exposure and proxy outcome can then be measured and used as a proxy estimate for the effects of unknown/unmeasured confounders on the outcome of interest. Performance of this approach is tested by a simulation study, whereby 500 different scenarios are generated, with the causal factors of a proxy outcome and a study outcome being partly overlapped under low-to-moderate correlations. Results: The simulation results demonstrate that the conventional approach only led to a correct conclusion in 21% of the 500 scenarios, as compared to 72.2% for the alternative approach. Conclusion: The proposed method can be applied in observational studies in social science and health research that evaluates the health impact of behaviour and mental health problems.

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