5. You conducted a series of observational studies looking for an association be

Question

5. You conducted a series of observational studies looking for an association between exposure to second hand smoke and childhood asthma.

a) First you conducted a cross-sectional study. Your prevalence odds ratio is 3.7. Interpret this outcome.

b) (5) Next you conducted a case-control study with a resulting odds ratio of 5.0. Interpret this outcome.

c) (5) With the results from the first two studies, you were able to get funding for a cohort study. At the end of the 25 year study, your risk ratio was 4.5. Provide an interpretation for this outcome.

Explanation / Answer

a) As the odds ratio is 3.7 which is greater than 1, so we can conclude that exposure to second hand smoke is associated with childhood asthma.

b) The odds ratio is 5.0 which is also greater than 1, so we can conclude again that exposure to second hand smoke is associated with childhood asthma, maybe more associated.

c) risk ratio is 4.5 which implies that childhood asthma is 4.5 times as likely as the others to exposure to the second hand smoke.

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