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First is what we call selection bias

Of these respondents, 8% were removed from the sample following data quality checks that included identification of instances where the survey was completed multiple times from the same device, completion time was too short for appropriate participation, and excessive straight line responses were provided (i.e

For the general public seeking pulmonologist advice for smokers, the message is simple: the earlier you quit, the more lung function you preserve

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Which Tobacco Monster Is Right for You

NHIS =National Health Interview Survey