British Lung Foundation
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Other Risks

Smokers with chronic bronchitis have a higher risk of lung cancer than those who smoke with no bronchitis. Research "found evidence of a strong association between COPD and lung cancer, but this was largely explained by the effect of smoking and is most apparent in recently diagnosed cases of COPD, suggesting a strong element of ascertainment bias."

International Association for the Study of Lung Cancer's IASLC

2 Replies

Thanks Gipper for this, but ooh er, what is an ascertainment bias please?


I read it as they find one when looking for the other with a dictionary line

1. To discover with certainty, as through examination or experimentation

only how it seems for me not a medical one


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