1. Below is a table from a hypothetical cohort study of 3,000 cigarette smokers and 5,000 non-smokers...
Question:
Developed CHD | Did not develop CHD | Total | |
Smokes cigarettes | 84 | 2916 | 3000 |
Non smoker | 87 | 4913 | 5000 |
171 | 7829 |
Question: Calculate the risk ratio using the data presented above.
RR = (87/5000)/(84/3000) = 0.62
RR = (84/171)/(2916/7829)= 1.32
RR = (84/3000)/(87/5000) = 1.61
RR = (84*4913)/(87*2916) = 1.63
2. Which offers the best interpretation of the risk ratio calculated in the previous question? (assume xx represents the correct number)
Group of answer choices
People who smoke are xx% more likley to develop CHD compared to non-smokers.
Subjects with smoking exposure have an incidence of CHD that is xx% higher than subjects without
smoking exposure.
CHD could be prevented or reduced in approximately xx per 1000 subjects who smoke if they did not smoke.
Approximately xx % of the incidence of CHD in subjects who smoke could be prevented or reduced if the subjects did not smoke.
Understanding Business Statistics
ISBN: 978-1118145258
1st edition
Authors: Stacey Jones, Tim Bergquist, Ned Freed