#
Suggested answer to exercise: Glioma and mobile phones, 3

Question 3: How can we interpret the odds ratio 0.94 in this study?

##
Suggested answer

This is case control study and glioma is a rare condition,
so we can interpret the odds ratio as an estimate of the relative risk.
We estimate that the risk of glioma for mobile phone users is 0.94 times
the risk among non-mobile-phome-users.

This is because the odds ratio is unaffected by the ratio of cases
to controls and so the odds ratio from the case-control study
is an estimate of the odds ratio for the entire population.
Provided the proportion of cases in the whole population is small,
the odds ratio and the relative risk will be vey similar.

Back to Exercise: Glioma and mobile phones.

To Clinical Biostatistics index.

To Martin Bland's M.Sc. index.

To Martin Bland's home page.

This page maintained by Martin Bland.

Last updated: 31 Jul, 2006.

Back to top.