At baseline (time of study enrollment}, all participants were screened and determined to be cancer free, and their body mass index (BMI) was calculated.
3. (5 points) A study followed 900,000 US adults from 2001 to 2017. At baseline (time of study enrollment}, all participants were screened and determined to be cancer free, and their body mass index (BMI) was calculated. Body mass index is a measure of obesity that is calculated using a person’s height and weight. Subjects were separated into the following groups according to their BMI: (a) normal weight, (b) slightly overweight, (c) moderately ovennreight and (d) greatly overweight. A total of 57,145 deaths from cancer occurred in the population during the follow-up period. This study used self-administered i self-report mailed questionnaires to gather data on height and weight to calculate the exposure measure of obesity. Participants ﬁlled out these questionnaires on their own and mailed them back. Which of the following types of problems were surely avoided by this method of exposure data collection? Circle or highlight any that apply. Interviewer bias Exposure misclassification Confounding Selection bias Loss-to—follow-up
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