12) The association between cellular telephone use and the risk of brain cancer was investigated in acase-control study. The study included 335 cases and 300 controls, and the following results wereobtained:Cellular YesPhoneUserNoTotalCellPhoneUsersCases Controls225Yes11033512a) Calculate the odds ratio based on these data and provide a brief interpretation.15012b) If the 95% confidence interval for the odds ratio is 1.75 -2.14, and a = 0.05, which of thefollowing represents an appropriate conclusion for this finding:111 100150a) The true strength of association could be estimated more precisely if the study were repeatedwith a larger sampleb) The association is "statistically significant"c) The "p-value" associated with this odds ratio is less than 0.05.d) All of the above30012 continued) Gender was considered a potential confounder and effect measure modifier in thisstudy, and the data were stratified accordingly:MalesCases Controls29 50No 95 5010012c) Calculate the odds ratios for the association between cell phone use and brain cancer risk,stratified by gender and provide a brief interpretation12d) Is gender a confounder in this study? ExplainYesNoFemales12e) Is gender an effect measure modifier in this study? ExplainCases Controls100

The association between cellular telephone use and the risk of brain cancer was investigated in a…

Answered: 12) The association between cellular…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A food-frequency questionnaire is used to measure dietary intake. The respondent specifies the number of servings of various food items they consumed over the previous week. The dietary cholesterol is then quantified for each respondent. The researchers were interested in assessing if there was an association between dietary cholesterol intake and high blood pressure. In a large sample of individuals who had completed the questionnaire, 250 persons with a high dietary cholesterol intake (greater than 300 mg /day) were selected and 250 persons with a low dietary cholesterol intake (less than 300 mg/day) were selected. The 500 selected participants had their medical history taken and were classified as having normal or high blood pressure. The data are given here. Dietary Cholesterol Blood Pressure Total High Low High 159 91 250 Low 78 172 250 Total 237 263 500 Test 2: two-tailed test for comparing two independent proportions Clearly state…
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2) Consider the following data from a hypothetical case control study examining the relationship between tanning bed use in young adulthood and risk of melanoma Cases 688 196 History of Tanning Bed Use Yes No Controls 288 864 a) Name the appropriate measure of association for estimating the relative risk of melanoma, comparing tanning bed users (exposed) to nonusers (reference category). Calculate this measure and provide a brief interpretation of your answer b) Assume that this relationship is causal. Among young people who use tanning beds, what proportion of melanoma risk could be eliminated by banning tanning bed use in young adults? c) If 4% of all young adults use tanning beds, what proportion of melanoma risk could be eliminated from the overall general population by banning the use of tanning beds in young adults?
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The following is data about the hemoglobin concentrations of volunteers collected at sea level and at an altitude of 11000 feet. sea level concentrations = [14.70 , 15.22, 15.28, 16.58, 15.10 , 15.66, 15.91, 14.41, 14.73, 15.09, 15.62, 14.92]11000 feet concentrations = [14.81, 15.68, 15.57, 16.59, 15.21, 15.69, 16.16, 14.68, 15.09, 15.30 , 16.15, 14.76] There are two alternative scenarios about the way the data were obtained. In scenario 1, there are 12 volunteers who lived for a month at sea level, at which time blood was drawn and the data in "sea level concentrations" dataset were obtained. Subsequently, all 12 volunteers were moved to 11000 ft and after a month the data in the "11000 feet concentrations" dataset obtained. There is a one to one correspondence between the numbers in the two datasets, that is the first numbers correspond to volunteer1, the second numbers to volunteer2 etc. In scenario 2, the "sea level concentrations" dataset is a random sample obtained from 12…
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12) The association between cellular telephone use and the risk of brain cancer was inve case-control study. The study included 335 cases and 300 controls, and the following res obtained: Cellular Yes Phone User No Total Cases Controls 225 150 110 335 300 150