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Table of Contents
Vol. 72, No. 3, 2011
Issue release date: November 2011
Section title: Original Paper
Hum Hered 2011;72:194–205

A Comparison of Approaches to Control for Confounding Factors by Regression Models

Xing G.a · Lin C.-Y.b · Xing C.b, c
aBristol-Myers Squibb Company, Pennington, N.J., bMcDermott Center of Human Growth and Development and cDepartment of Clinical Sciences, University of Texas Southwestern Medical Center, Dallas, Tex., USA
email Corresponding Author

Chao Xing, PhD

MC 8591, University of Texas Southwestern Medical Center

5323 Harry Hines Boulevard

Dallas, TX 75390 (USA)

Tel. +1 214 648 1695, E-Mail chao.xing@utsouthwestern.edu

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A common technique to control for confounding factors in practice is by regression adjustment. There are various versions of regression modeling in the literature, and in this paper we considered four approaches often seen in genetic association studies. We carried out both analytical and simulation studies comparing the bias of effect size estimates and examining the test sizes under the null hypothesis of no association between an outcome and an exposure. Further, we compared the methods in a nonsynonymous genome-wide scan for plasma lipoprotein(a) levels using a dataset from the Dallas Heart Study. We found that a widely employed approach that models the covariate-adjusted outcome and the exposure leads to an infranominal test size and underestimation of the exposure effect size. In conclusion, we recommend either using multiple regression models or modeling the covariate-adjusted outcome and the covariate-adjusted exposure to control for confounding factors.

© 2011 S. Karger AG, Basel

Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: July 22, 2011
Accepted: September 01, 2011
Published online: November 11, 2011
Issue release date: November 2011

Number of Print Pages: 12
Number of Figures: 5
Number of Tables: 2

ISSN: 0001-5652 (Print)
eISSN: 1423-0062 (Online)

For additional information: http://www.karger.com/HHE

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