Odds ratio

{
  "id": "MLC-T-ENV-019356",
  "term": "Odds ratio",
  "field": "Environment",
  "term_source": "Odds Ratio",
  "definition": "1. A relative measure of the difference in exposure between the diseased (cases) and not diseased (controls) individuals in a case-control study. The OR is interpreted similarly to the relative risk.\n\n2. A measure of association that quantifies the relationship between an exposure and health outcome from a comparative study; also known as the cross-product ratio.\n\n3. A measure of treatment effect that compares the probability of a type of outcome in the treatment group with the outcome of a control group, i.e., [Pt ÷ (1 - Pt)] [Pc ÷ (1 - Pc)]. For instance, if the results of a trial were that the probability of death in a control group was 25% and the probability of death in a treatment group was 10%, the odds ratio of survival would be [0.10 ÷ (1.0 - 0.10)] ÷ [(0.25 ÷ (1.0 - 0.25)] = 0.33.\n\n4. Measure of association that quantifies the relationship between an exposure and health outcome from a comparative study; also known as the cross-product ratio.\n\n5. Measure of treatment effect that compares the probability of a type of outcome in the treatment group with the outcome of a control group, i.e., [Pt ÷ (1 - Pt)] [Pc ÷ (1 - Pc)]. For instance, if the results of a trial were that the probability of death in a control group was 25% and the probability of death in a treatment group was 10%, the odds ratio of survival would be [0.10 ÷ (1.0 - 0.10)] ÷ [(0.25 ÷ (1.0 - 0.25)] = 0.33.\n\n6. Measure of association which quantifies the relationship between an exposure and health outcome from a comparative study; also known as the cross-product ratio.",
  "abbreviation": "OR",
  "subject": "Health and safety",
  "references": [
    "Integrated Risk Information System (IRIS) Glossary; EPA 2003; Thesaurus of Terms Used in Microbial Risk Assessment",
    "CDC 2005",
    "NLM/NICHSR 2004",
    "CDC 2005; Thesaurus of Terms Used in Microbial Risk Assessment",
    "NLM/NICHSR 2004; Thesaurus of Terms Used in Microbial Risk Assessment",
    "CDC Epidemiology Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/odds-ratio/"
}