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Odds and odds ratio

 

Odds

A ratio of the number of people incurring an event to the number of people who have non-events. Odds and odds ratios are explained here. An example might help.

Odds ratio

The ratio of the odds of having the target disorder in the experimental group relative to the odds in favour of having the target disorder in the control group (in cohort studies or systematic reviews) or the odds in favour of being exposed in subjects with the target disorder divided by the odds in favour of being exposed in control subjects (without the target disorder).

Odds and odds ratios are explained here. An example might help.
Also use this download on "Outputs and utility"