Bayesian modelling of lung cancer risk and bitumen fume exposure adjusted for unmeasured confounding by smoking.
OBJECTIVE
Residual confounding can be present in epidemiological studies because information on confounding factors was not collected. A Bayesian framework, which has the advantage over frequentist methods that the uncertainty in the association between the confounding factor and exposure and disease can be reflected in the credible intervals of the risk parameter, is proposed to assess the magnitude and direction of this bias.


METHODS
To illustrate this method, bias from smoking as an unmeasured confounder in a cohort study of lung cancer risk in the European asphalt industry was assessed. A Poisson disease model was specified to assess lung cancer risk associated with career average, cumulative and lagged bitumen fume exposure. Prior distributions for the exposure strata, as well as for other covariates, were specified as uninformative normal distributions. The priors on smoking habits were specified as Dirichlet distributions based on smoking prevalence estimates available for a sub-cohort and assumptions about precision of these estimates.


RESULTS
Median bias in this example was estimated at 13%, and suggested an attenuating effect on the original exposure-disease associations. Nonetheless, the results still implied an increased lung cancer risk, especially for average exposure.


CONCLUSIONS
This Bayesian framework provides a method to assess the bias from an unmeasured confounding factor taking into account the uncertainty surrounding the estimate and from random sampling error. Specifically for this example, the bias arising from unmeasured smoking history in this asphalt workers' cohort is unlikely to explain the increased lung cancer risk associated with average bitumen fume exposure found in the original study.
de Vocht
F
F
Occupational and Environmental Health Research Group, School of Translational Medicine, Faculty of Medical and Human Sciences, The University of Manchester, Manchester M13 8GE, UK. frank.devocht@manchester.ac.uk
Kromhout
H
H
Ferro
G
G
Boffetta
P
P
Burstyn
I
I
D000395:Air Pollutants, Occupational / Q000633:toxicity; D001499:Bayes Theorem; D015982:Bias; D015331:Cohort Studies; D015986:Confounding Factors, Epidemiologic; D005060:Europe / Q000453:epidemiology; D006801:Humans; D006838:Hydrocarbons / Q000633:toxicity; D019570:Inhalation Exposure / Q000706:statistics & numerical data; D007557:Israel / Q000453:epidemiology; D008175:Lung Neoplasms / Q000453:epidemiology / Q000209:etiology*; D008297:Male; D009784:Occupational Diseases / Q000453:epidemiology / Q000209:etiology*; D016273:Occupational Exposure / Q000009:adverse effects* / Q000706:statistics & numerical data; D012306:Risk; D012906:Smoke / Q000009:adverse effects; D012907:Smoking / Q000009:adverse effects* / Q000453:epidemiology
D000395:Air Pollutants, Occupational; D006838:Hydrocarbons; D012906:Smoke; C006647:asphalt