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Effect of Smoking on Breast Cancer by Adjusting for Smoking Misclassification Bias and Confounders Using a Probabilistic Bias Analysis Method
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Effect of Smoking on Breast Cancer by Adjusting for Smoking Misclassification Bias and Confounders Using a Probabilistic Bias Analysis Method
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Journal Article
Effect of Smoking on Breast Cancer by Adjusting for Smoking Misclassification Bias and Confounders Using a Probabilistic Bias Analysis Method
2020
Overview
The aim of this study was to determine the association between smoking and breast cancer after adjusting for smoking misclassification bias and confounders.
In this case-control study, 1000 women with breast cancer and 1000 healthy controls were selected. Using a probabilistic bias analysis method, the association between smoking and breast cancer was adjusted for the bias resulting from misclassification of smoking secondary to self-reporting as well as a minimally sufficient adjustment set of confounders derived from a causal directed acyclic graph (cDAG). Population attributable fraction (PAF) for smoking was calculated using Miettinen's formula.
While the odds ratio (OR) from the conventional logistic regression model between smoking and breast cancer was 0.64 (95% CI: 0.36-1.13), the adjusted ORs from the probabilistic bias analysis were in the ranges of 2.63-2.69 and 1.73-2.83 for non-differential and differential misclassification, respectively. PAF ranges obtained were 1.36-1.72% and 0.62-2.01% using the non-differential bias analysis and differential bias analysis, respectively.
After misclassification correction for smoking, the non-significant negative-adjusted association between smoking and breast cancer changed to a significant positive-adjusted association.
Publisher
Dove Medical Press Limited,Taylor & Francis Ltd,Dove,Dove Medical Press
Subject
