Saturday, November 7, 2009

What does an odds ratio of 1.6 mean?

In particular, is the statement: "The odds ratio of becoming obese among children increased 1路6 times for each additional can or glass of sugar-sweetened drink that they consumed every day. "The same as:Each glass of sugar-sweetened drink consume per day will increase a child's chances of becoming obese by 60%
Answers:
The other two responses are not entirely accurate. This is how it would be written: "The odds of becoming obese increased by 60% for each unit increase in can or glass of sugar drink consumed". This is the correct way to report odds ratio's. Remember that you can't confuse odds with risk ratios so never report it as someone is 1.6 times more likely than x. This is how many people report it in the literature, which is wrong.
Yep, they are essentially the same.
The odds ratio is a measure of effect size particularly important.
It is defined as the ratio of the odds of an event occurring in one group to the odds of it occurring in another group, or to a data-based estimate of that ratio. These groups might be men and women, an experimental group and a control group, or any other dichotomous classification. So if the probabilities of the event in each of the groups are p (first group) and q (second group). Then the ratio is what ever you come up with.

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