NCIt definition : The ratio of the odds of an event occurring in one group to the odds of it occurring
in another group, or to a sample-based estimate of that ratio.;
Alternative definition : NCI-GLOSS: A measure of the odds of an event happening in one group compared to the
odds of the same event happening in another group. In cancer research, odds ratios
are most often used in case-control (backward looking) studies to find out if being
exposed to a certain substance or other factor increases the risk of cancer. For example,
researchers may study a group of individuals with cancer (cases) and another group
without cancer (controls) to see how many people in each group were exposed to a certain
substance or factor. They calculate the odds of exposure in both groups and then compare
the odds. An odds ratio of one means that both groups had the same odds of exposure
and, therefore, the exposure probably does not increase the risk of cancer. An odds
ratio of greater than one means that the exposure may increase the risk of cancer,
and an odds ratio of less than one means that the exposure may reduce the risk of
cancer.; CDISC: The ratio of the probability of an event occurring in one group to the probability
of it occurring in another group, or to a sample-based estimate of that ratio.; MRCT-Ctr: The chance of a health event happening in one group compared with the chance
of the same event happening in another group. (https://mrctcenter.org/glossaryterm/odds-ratio/);
NCIt note : An odds ratio of 1 indicates that the condition or event under study is equally likely
in both groups. An odds ratio greater than 1 indicates that the condition or event
is more likely in the first group. And an odds ratio less than 1 indicates that the
condition or event is less likely in the first group.;
Codes from synonyms : CDR0000618610; CDR0000618611;
Automatic exact mappings (from CISMeF team)