Odds Ratio

**Definition:** The ratio of two odds. The exposure-odds ratio for case control data is the ratio of the odds in favor of exposure among cases to the odds in favor of exposure among noncases. The disease-odds ratio for a cohort or cross section is the ratio of the odds in favor of disease among the exposed to the odds in favor of disease among the unexposed. The prevalence-odds ratio refers to an odds ratio derived cross-sectionally from studies of prevalent cases.

**Tree numbers:** - E05.318.740.600.600 - G17.680.500 - N05.715.360.750.625.590 - N06.850.520.830.600.600

**Synonyms:** - Cross-Product Ratio - Relative Odds - Risk Ratio