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May 22, 2023 · The odds ratio is a ratio of two sets of odds: the odds of the event occurring in an exposed group versus the odds of the event occurring in a non-exposed group. Odds ratios commonly are used to report case-control studies. The odds ratio helps identify how likely an exposure is to lead to a specific event.
- Steven Tenny, Mary R. Hoffman
- 2023/05/22
- University of Nebraska Medical Center
Jan 1, 2016 · The odds ratio (OR) is a simple tool, widely utilized in clinical research. As a simple statistic, it can be hand calculated to determine the odds of a particular event or a disease, and...
Apr 24, 2024 · Introduce the most common methods to assess risk in epidemiology: the odds ratio, and the relative risk. Learn how to analyze and report the odds ratio, and the relative risks as common methods of assessing risk from the results of epidemiological research studies
- Studies That Use Prevalence Data
- Conclusions
- References
Following participants while waiting for incident cases of disease is expensive and time-consuming. Often, epidemiologists need a faster (and cheaper) answer to their question about a particular exposure/disease combination. One might instead take advantage of prevalent cases of disease, which by definition have already occurred and therefore requi...
Epidemiologic data are often summarized in 2 × 2 tables. There are 2 main measures of association commonly used in epidemiology: the risk ratio/rate ratio (relative risk) and the odds ratio. The former is calculated for study designs that collect data on incidence: cohorts and RCTs. The latter is calculated for study designs that use prevalent case...
i. Bodner K, Bodner-Adler B, Wierrani F, Mayerhofer K, Fousek C, Niedermayr A, Grünberger. Effects of water birth on maternal and neonatal outcomes. Wien Klin Wochenschr. 2002;114(10-11):391-395. (↵ Return) ii. Declercq E. The absolute power of relative risk in debates on repeat cesareans and home birth in the United States. J Clin Ethics. 2013;24(...
- Marit L. Bovbjerg
- 2020
The odds ratio is used when one of two possible events or outcomes are measured, and there is a supposed causative factor. The odds ratio is a versatile and robust statistic. For example, it can calculate the odds of an event happening given a particular treatment intervention (1).
- Mary L. McHugh
- 2009
Risk and odds ratios are calculated by using either cumulative risk (from longitudinal studies) or prevalence (from cross-sectional studies). The risk ratio gives the relative increase or decrease in the risk (or prevalence) of the outcome given a particular exposure or treatment; the odds ratio is similar but gives the
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How are risk ratios and odds ratios calculated?
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What is odds ratio?
What is odds ratio in clinical research?
The risk difference (RD) is the difference between the absolute risks of 2 interventions or risk factors. The RD represents excess risk attributed to the group with the higher risk. The odds ratio can estimate the risk ratio when the probability of an event is ≤10%.
