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Researchers conducted a cohort study of the association between air pollution and asthma. The rate ratio was...

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Question

Biology

Researchers conducted a cohort study of the association betweenair pollution and asthma. The

rate ratio was 8.0, when comparing those exposed to high levelsof air pollution with those

exposed to low levels of air pollution. Which of the followingissues should the researchers

consider when making their study conclusions and when thinkingabout causality? Choose all

that apply and explain your choice.

a) The rate ratio of 8.0 indicates a strong association, whichlends support for causality

b) Strong confounding may actually be causing the strongassociation seen

c) Other studies of the same exposure—health outcome associationreported rate ratios in the

range of 1.5-3.0, less than the rate ratio of 8.0 seen in thisstudy

d) The temporal sequence of the exposure and outcome should beknown in order to draw

accurate conclusion.

Answer & Explanation Solved by verified expert
3.6 Ratings (337 Votes)
a the rate ratio of 80 indicates a strong association Exposure to high level or level of air pollution causes health problems especially respiratory problems Causality for the strong association bring    See Answer
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