Why Form 8854 Attributable 2023-2024

One of the patients with lung cancer. 100 patients without lung cancer were enrolled in a hypothetical study. They were questioned about tobacco use of the previous 20 years. 90 of the lung cancer patients reported smoking, as did 10 of the patients without lung cancer. So the goal of this study is to figure out the association between smoking and lung cancer. Furthermore, we'd like to calculate some quantitative measure of this association. To do this though, we'll have to figure out what study type this is. This particular study describes enrolling patients with lung cancer and enrolling a group of patients without lung cancer. They went backward in time over the previous 20 years and questioned them about smoking. So, this particular study describes a case-control study. The reason I know it's a case-control study is because case-control studies start with disease and go backward in time looking for exposures. So, case-control studies measure the association that we would calculate is called an odds ratio. Odds ratios are just that, a ratio of odds. So, in this case, we will be calculating the odds of being exposed to cigarette smoking if you have lung cancer divided by the odds of being exposed to cigarette smoking if you don't have lung cancer. We have to plug in some numbers. By convention, on the two by two table, disease status goes across the top. So, we'll have a group of patients with lung cancer and a group of patients who don't have lung cancer. Then, exposure status goes across the side over here. So, we'll have a group of people who smoke and a group of people who don't smoke. Now we just need to fill in the 2x2 table. I said I enrolled a hundred patients with lung cancer, so the total number...