Calculate the RR of lung cancer in smokers following information

Question 5 / 8:

The following information is for Questions 4?-5

The 1 year risk (i.e. annual incidence) of lung cancer in smokers is 140 per 100,000. The 1 year risk of lung cancer in non?-smokers of the general population is 10 per 100,000.

Calculate the RR of lung cancer in smokers vs. non?-smokers.

Answer:

RR=140/100,000 divided by 10/100,000 = 14

Note: When the disease is rare (as is lung cancer) the OR approximates the RR.

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Epidemiology & Biostatistics Cohort Studies

Author:

Dr.Janet ForresterProfessor

Tufts University School of Medicine

USA

Access: Public Peer Review

Attribution: Janet, E.A. Forrester, Kwan Ho Kenneth Chui, Steven Cohen, Michael D. Kneeland, Alice Tang, David Tybor. Epidemiology and Biostatistics 2010. (Tufts University OpenCourseWare), http://ocw.tufts.edu/Course/65/ (Accessed 3 May, 2014). License: Creative Commons BY-NC-SA

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