Instructions: Download and read this journal article: Hepworth SJ, Schoemaker MJ
ID: 3045568 • Letter: I
Question
Instructions: Download and read this journal article: Hepworth SJ, Schoemaker MJ, Muir KR, Swerdlow AJ, van Tongeren MJ, McKinney PA. Mobile phone use and risk of glioma in adults: case-control study. BMJ. 2006 Apr 15:332(7546):883-7. We learned that one of the advantages of case-control studies is that you can investigate multiple exposures. They did that in this study. For example, if you look in Table 2 on page 3, you can see many different exposure variables listed in the left column of the table. But for this assignment, we are only going to focus on the first one: "Frequency of use." You don't need to consider the others. You will notice that one level of the variable "Frequency of use" is labeled "Not known." Please cross out that level of the variable in the table as in this picture. Table 2 Odds ratios and 95% confidence intervals tor risk of gloma in relation to mobile phone exposure". Figures are numbers (percentages) of participants Contrels -1716) cases(m-966) Factor and level of exposure Frequency of use 0tts ratet os 56 (47 2) 818 477 08 (526) 898(523)094 (0.78 to 1.13 1.00 Reguiar So, for this homework you should consider that there are 964 cases instead of 966. Also, consider that the category "not known" was never included in the table or model. Notice also that they use the word "risk" in the table title. Technically, this should say "odds." Each question is worth one point. 1. Focusing on the model above shown in table 2, what is the outcome variable? Maximum characters including spaces: 100 Page 1 of 5Explanation / Answer
The outcome variable is also known as the dependent variable which in this case is the the number of observations present in each group
the independent variables are
the frequency of use groups with 2 levels - Non regular and regular
the other independent variable is the 2 groups used for control and cases