Four studies were done to measure the risk of heart attack among males who were age 60 years at enrollment. Each study subject was followed for the entire follow-up period; there were no drop-outs or loss to follow-up. Details from each of these studies is shown below. # of subjects Time followedNumber of cases Study 110010 years100.10Study 22007 years140.07Study 33005 years180.06Study 44002 years80.02Is it correct to conclude that the risk (shown in th last column) of heart attack was greatest in Study 1? Choose the best answer. a) It is incorrect. For each study, one must divide the number of new cases by the total number of accumulated person*years in order to compare the risks.b)It is incorrect. The follow-up period is different for each study. One cannot directly compare a 10-year risk with (for example) a 7-year risk.

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Answered: Four studies were done to measure the…

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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Four studies were done to measure the risk of heart attack among males who were age 60 years at enrollment. Each study subject was followed for the entire follow-up period; there were no drop-outs or loss to follow-up. Details from each of these studies is shown below.

	# of subjects	Time followed	Number of cases
Study 1	100	10 years	10	0.10
Study 2	200	7 years	14	0.07
Study 3	300	5 years	18	0.06
Study 4	400	2 years	8	0.02

Is it correct to conclude that the risk (shown in th last column) of heart attack was greatest in Study 1? Choose the best answer.

a) It is incorrect. For each study, one must divide the number of new cases by the total number of accumulated person*years in order to compare the risks.

b)It is incorrect. The follow-up period is different for each study. One cannot directly compare a 10-year risk with (for example) a 7-year risk.

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