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     • The odds ratio (OR) is a measure of how strongly an event is associated with exposure. 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.
     www.ncbi.nlm.nih.gov/books/NBK431098/

     Odds Ratio - StatPearls - NCBI Bookshelf

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   What is an odds ratio?

   • An odds ratio (OR) is a measure of association between an exposure and an outcome. The OR represents the odds that an outcome will occur given a particular exposure, compared to the odds of the outcome occurring in the absence of that expo-sure.

   Explaining Odds Ratios

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   Is the odds ratio statistically significant?

   • If the confidence interval for the odds ratio includes the number 1 then the calculated odds ratio would not be considered statistically significant. This can be seen from the interpretation of the odds ratio. An odds ratio greater than 1 implies there are greater odds of the event happening in the exposed versus the non-exposed group.

   Odds Ratio - StatPearls - NCBI Bookshelf - National Center for

   www.ncbi.nlm.nih.gov/books/NBK431098/

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   What does it mean if odds ratio is less than 1?

   • This can be seen from the interpretation of the odds ratio. An odds ratio greater than 1 implies there are greater odds of the event happening in the exposed versus the non-exposed group. An odds ratio of less than 1 implies the odds of the event happening in the exposed group are less than in the non-exposed group.

   Odds Ratio - StatPearls - NCBI Bookshelf - National Center for

   www.ncbi.nlm.nih.gov/books/NBK431098/

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   What is the odds ratio in a 2-by-2 table?

   • In a 2-by-2 table with cells a, b, c, and d (see figure), the odds ratio is odds of the event in the exposure group (a/b) divided by the odds of the event in the control or non-exposure group (c/d). Thus the odds ratio is (a/b) / (c/d) which simplifies to ad/bc. This is compared to the relative risk which is (a / (a+b)) / (c / (c+d)).

   Odds Ratio - StatPearls - NCBI Bookshelf - National Center for

   www.ncbi.nlm.nih.gov/books/NBK431098/

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   How do you calculate odds ratio?

   • Odds Ratio = (odds of the event in the exposed group) / (odds of the event in the non-exposed group) If the data is set up in a 2 x 2 table as shown in the figure then the odds ratio is (a/b) / (c/d) = ad/bc. The following is an example to demonstrate calculating the odds ratio (OR). Example 1

   Odds Ratio - StatPearls - NCBI Bookshelf - National Center for

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   What is odds ratio & relative risk?

   • The odds ratio can be confused with relative risk. As stated above, the odds ratio is a ratio of 2 odds. As odds of an event are always positive, the odds ratio is always positive and ranges from zero to very large.

   Odds Ratio - StatPearls - NCBI Bookshelf - National Center for

   www.ncbi.nlm.nih.gov/books/NBK431098/

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3. www.ncbi.nlm.nih.gov › books › NBK431098Odds Ratio - StatPearls - NCBI Bookshelf

   www.ncbi.nlm.nih.gov › books › NBK431098

   May 22, 2023 · The odds ratio (OR) is a measure of how strongly an event is associated with exposure. 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.

   • Author: Steven Tenny, Mary R. Hoffman
   • Published: 2023/05/22

   • Affiliations: University of Nebraska Medical Center

4. pubmed.ncbi.nlm.nih.gov › 20842279Explaining odds ratios - PubMed

   pubmed.ncbi.nlm.nih.gov › 20842279

   Explaining odds ratios. J Can Acad Child Adolesc Psychiatry. 2010 Aug;19 (3):227-9. Author. Magdalena Szumilas 1. Affiliation. 1 Research Associate, Sun Life Financial Chair in Adolescent Mental Health, IWK Health Centre & Dalhousie University, Maritime Outpatient Psychiatry, Halifax, Nova Scotia. PMID: 20842279. PMCID: PMC2938757.

   • Author: Magdalena Szumilas

   • Publish Year: 2010

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6. europepmc.org › article › MEDExplaining odds ratios. - Abstract - Europe PMC

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   Aug 1, 2010 · What is an odds ratio? An odds ratio (OR) is a measure of association between an exposure and an outcome. The OR represents the odds that an outcome will occur given a particular exposure, compared to the odds of the outcome occurring in the absence of that exposure.

   • Author: Magdalena Szumilas

   • Publish Year: 2010

7. bpb-us-w2.wpmucdn.com › Explaining-Odds-RatiosExplaining Odds Ratios

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   What is an odds ratio? An odds ratio (OR) is a measure of association between an exposure and an outcome. The OR represents the odds that an outcome will occur given a particular exposure, compared to the odds of the outcome occurring in the absence of that expo-sure. Odds ratios are most commonly used in case-control stud-

8. litfl.com › odOdds ratio • LITFL • CCC Research

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   Nov 3, 2020 · An odds ratio (OR) is a measure of association between an exposure and an outcome. The OR represents the odds that an outcome will occur given a particular exposure, compared to the odds of the outcome occurring in the absence of that exposure.

9. www.nejm.org › doi › fullTrends in Mental Health Care among Children and Adolescents

   www.nejm.org › doi › full

   May 21, 2015 · Results. The percentage of youths receiving any outpatient mental health service increased from 9.2% in 1996–1998 to 13.3% in 2010–2012 (odds ratio, 1.52; 95% confidence interval, 1.35 to...

10. www.jaacap.org › article › S0890-8567(12)01003-9Risks Interpreting Odds - Journal of the American Academy of ...

    www.jaacap.org › article › S0890-8567(12)01003-9

    The odds ratio is a good estimate of relative risk when probability of the outcome—development of SAD in this study—is small. 2 However, odds ratios grow increasingly larger than relative risks as outcome probabilities increase toward 0.5 and can inflate perceived magnitudes of association or effect. 3 Even when presented clearly, the odds ...