Using established occupational respiratory cancer risk factors for assessing the internal validity in an unmatched case-control study in the Campania Region of Italy, 1988-1990

Background. It is important to ensure the validity of softer epidemiological data such as occupational histories. Validation of the larger case-control study, on the well-established confounders of tobacco and alcohol consumption and from which the present dataset derives, has strongly supported the utility of our dataset. As a further step in validating our dataset, we examined the specificity of several workplace risk factors in relation to...