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How Big is a Big Odds Ratio? Interpreting the Magnitudes of Odds Ratios in Epidemiological Studies
Abstract
The odds ratio (OR) is probably the most widely used index of effect size in epidemiological studies. The difficulty of interpreting the OR has troubled many clinical researchers and epidemiologists for a long time. We propose a new method for interpreting the size of the OR by relating it to differences in a normal standard deviate. Our calculations indicate that OR = 1.68, 3.47, and 6.71 are equivalent to Cohen's d = 0.2 (small), 0.5 (medium), and 0.8 (large), respectively, when disease rate is 1% in the nonexposed group; Cohen's d < 0.2 when OR <1.5, and Cohen's d > 0.8 when OR > 5.
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“Although the effect sizes of Hedges g and OR can be difficult to compare, outcomes based on continuous data and reported as Hedges g, appeared to generate larger effect sizes compared with dichotomous scoring, reported as OR [91].”
From The psychological subtype of intimate partner violence and its effect on mental health: a systematic review with meta-analyses (2022) · cites this paper as [91]
In the citing paper
“The mentoring structures and outcomes of the students in our study differed based on their gender and race/ethnicity, although the sizes of these differences were small (Cohen, 1992; Chen et al., 2010).”
From Race and Gender Differences in Undergraduate Research Mentoring Structures and Research Outcomes (2017) · cites this paper as Chen et al., 2010
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“Cohen’s d was used to report effect size to compare the probability as a function of either accepting the vaccine or not accepting the vaccine [33].”
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“The authors found significantly lower selection probability for additional ethnic minority groups, men and lower SES groups, although the results were negligible in terms of statistical effect size (Chen et al., 2010).”
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“With respect to practical significance, this threefold increase in the odds is considered to be small but meaningful effect size (Chen et al., 2010).”
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“An OR of 1.68, 3.47, and 6.71 are equivalent to a small, medium, and large effect size (Cohen’s d ), respectively (Chen, Cohen, & Chen, 2010).”
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Real-world clinical predictors of manic/hypomanic episodes among outpatients with bipolar disorder
Tokumitsu, K., Yasui‐Furukori, N., Adachi, N., Kubota, Y., Watanabe, Y., Miki, K., Azekawa, T., Edagawa, K., Katsumoto, E., Hongo, S., et al. (2021) · PLoS ONE · doi:10.1371/journal.pone.0262129 · Cited by 13
“Moreover, the odds ratio may not be adequately approximated to the risk ratio because the event rate of manic/hypomanic episodes was greater than 10% [49].”
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“Effect sizes for this test were categorized by converting to Cohen’s d [8, 10] using the effectsize package in R [5, 6].”
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“This reduces the likelihood of having sufficient power to detect effects, especially since our effects were small (according to Chen, Cohen, & Chen's, 2010 , guidelines).”
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“67) to be of public health importance [45].”
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“This threshold indicates a moderate-to-strong effect size and is commonly applied in observational and epidemiologic studies to highlight associations that may be clinically meaningful and actionable [29, 30].”
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“To put these values into context, Chen et al. (2010) suggested that OR = 1.68, 3.47, and 6.71 are, for epidemiological analyses assuming an incidence of the harm of 1% in the nonexposed population, equivalent to Cohen’s (1988) suggested thresholds d = 0.02 (small effect), 0.5 (medium), and 0.8…”
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“We also calculated Cohen ’ s d for a given OR using the formula provided by Chen et al. (2010) and based on the STB outcome ’ s rate in the SA-free subgroup.”
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“…and a diet based on forage and concentrate were associated with the presence of parasites in the farm (OR = 9.31, CI = 1.93–44.9 and OR = 8.10, CI = 1.67–39.3, respectively), with a significant effect ( p = 0.001 and p = 0.003 respectively) as indicated by the magnitudes of the odds ratios [33].”
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“For single effects (either castration status or breed), the odds ratio [47] was applied with the following ranges according to Chen et al. [48]: Exp(B) < 1.68 - very small.”
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“This is considered a medium effect (Chen et al., 2010).”
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“While the Mixtral 8x22b demonstrates a noticeable improvement over Mixtral 8x7b, particularly in F1 scores and precision, it still falls short of the performance standards set by Llama 3.”
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“Like Study 1, these observational results are considered small, at least by some researchers in Epidemiology (Chen et al. 2010).”
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“The column labeled d is Cohen’s D, an effect size transformation (Chen et al. 2010) of the odds ratio (OR).”
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“If effect size was not reported it was calculated manually using Cohen's d and magnitude of effect size (Chen et al., 2010).”
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“The degree to which food insecurity overlaps with housing insecurity may have influenced the outcomes and the effect sizes are small for most of the independent variables (Chen et al., 2010), which means that there are other variables that may better be associated with the outcomes.”
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“20.(58,59) This corresponds to ORs less than 0.”
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“57 In turn, the same procedure was applied for follow-up studies reporting the influence of a 5 kg decrease in HGS test on the incidence of long-term health conditions.”
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“Importantly, while the Andrew Carnegie Effect is small to medium in size (Chen et al., 2010), it is an effect that is meaningful at the societal level.”
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“With a power of 0.80 and a type I error set to 5%, the sample size required was approximately 634 for small effects and 145 for medium effects [27].”
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“…0.05 ≤ r < 0.1—very small 0.1 ≤ r < 0.2—small 0.2 ≤ r < 0.3—medium 0.3 ≤ r < 0.4—large r ≥ 0.4—very large We employed Odds Ratio by Chen et al. [69] for single effects with the subsequent bandwidth [70]: Exp(B) < 1.68—very small 1.68 ≤ Exp(B) < 3.47—small 3.47 ≤ Exp(B) < 6.71—medium Exp(B) ≥…”
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“The magnitude of effect sizes was considered small (OR = 1.68; β = 0.10–0.29), medium (OR = 3.47; β = 0.30–049), or large (OR = 6.71; β ≥ 0.50) (Chen et al., 2010; Cohen, 1988).”
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“However, the interpretation of the OR requires caution; despite its statistical signi fi cance, the OR of 1.061 suggests a very weak association, representing only a slight uptick in injury risk with increased play-time (Chen et al., 2010).”
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“6 [13]) between parents who did and did not report side-effects from vaccination [10].”
BackgroundSupporting Inclusive Teaching in Introductory College Physics
Getty, S. R., Gosnell, N. M., Whitten, B. L., & Taylor, J. A. (2020) · The Physics Teacher · doi:10.1119/1.5145523 · Cited by 10
Szücs, D., Köhler, A., Holthaus, M. M., Güldenring, A., Balk, L., Motmans, J., & Nieder, T. O. (2021) · Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz · doi:10.1007/s00103-021-03432-8 · Cited by 10
Disordered eating symptoms in Austrian men of different ages in the context of fitness centers
Mangweth‐Matzek, B., Decker, B., Erschbaumer, I., Wurnig, V., Kemmler, G., Bichler, C. S., & Rupp, C. I. (2021) · Eating and Weight Disorders - Studies on Anorexia Bulimia and Obesity · doi:10.1007/s40519-021-01317-y · Cited by 12
Theodorou, E., Jones, B. P., Armas, D. C., Heath, C., Serhal, P. F., & Nagi, J. B. (2022) · Journal of Assisted Reproduction and Genetics · doi:10.1007/s10815-022-02440-0 · Cited by 10
Gu, C., Chen, J., Wei, W., Sun, J. L., Yang, C. K., Jiang, L., Hu, J., Lv, B., Lin, S., & Jiang, Q. (2022) · PLoS ONE · doi:10.1371/journal.pone.0264562 · Cited by 13
“verifies the hierarchical cluster analysis results’ accuracy [89].”
BackgroundTelehealth care before and during COVID-19: trends and quality in a large health system
Luna, P., Lee, M. L., Greeno, R. V., DeLucia, N., London, Y., Hoffman, P. E., Burg, M. M., Harris, K. M., Spatz, E. S., Mena‐Hurtado, C., et al. (2022) · JAMIA Open · doi:10.1093/jamiaopen/ooac079 · Cited by 10
Predictors of Accessibility Tool Use on a Low-Stakes Computer-Based Math Test
Witmer, S. E., & Bouck, E. C. (2023) · Assessment for Effective Intervention · doi:10.1177/15345084231152477 · Cited by 10
“Moreover, the odds ratio value of 1.12 suggests a very weak effect when considering an odds ratio value of 1.50 as the threshold for a small effect (Chen et al., 2010).”
BackgroundInfluentialThouin, É., Dupéré, V., Denault, A., & Schoon, I. (2023) · Developmental Psychology · doi:10.1037/dev0001536 · Cited by 10
“Chen et al.’s (2010) criteria accommodate ORs ≥ 1 representing positive associations, but not ORs < 1 representing negative associations.”
BackgroundMethodInfluentialO’Connell, M. E., Kadlec, H., Griffith, L. E., Wolfson, C. M., Maimon, G., Taler, V., Kirkland, S., & Raina, P. S. (2023) · Alzheimer s Research & Therapy · doi:10.1186/s13195-023-01317-3 · Cited by 16
“For the odds ratio (OR) estimates from the logistic regressions, we used the descriptors of magnitude of OR provided by Chen et al. [37], based on a rate of cognitive impairment of 4% in a cognitively healthy group for the 4-test CII: OR = 1.0 to 1.49 as trivial to 1.5 as small, 1.6 to 2.7 as…”
MethodInfluentialEarly Developmental Activities and Computing Proficiency
Cutts, Q. I., Patitsas, E., Cole, E., Donaldson, P., Alshaigy, B., Gutica, M., Hellas, A., Larraza-Mendiluze, E., McCartney, R., & Riedesel, C. P. (2018) · doi:10.1145/3174781.3174789 · Cited by 11
“Per [19] these are both considered to be medium effect sizes.”
BackgroundFrailty is associated with pain and cognitive function in older people in post-acute care settings
Tse, M. Y. M., Kwan, R. Y. C., Ho, S. S. M., Davidson, P. M., Cheng, P., & Yeung, S. S. Y. (2019) · Geriatric Nursing · doi:10.1016/j.gerinurse.2019.04.001 · Cited by 10
Personalized change awareness: Reducing information overload in loosely-coupled teamwork
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“5 and 3 are interpreted as a small effect, between 3 and 5 as medium, and above 5 as large [67, 68].”
BackgroundRaymond, B., Luckett, T., Johnson, M. J., Hutchinson, A., Lovell, M. R., & Phillips, J. L. (2019) · npj Primary Care Respiratory Medicine · doi:10.1038/s41533-019-0152-8 · Cited by 10
Developmental trajectory of communication repair in children with Fragile X Syndrome
Fielding-Gebhardt, H., Warren, S. F., & Brady, N. C. (2020) · Autism & Developmental Language Impairments · doi:10.1177/2396941520909014 · Cited by 10
“Effect size, calculated as an odds ratio (Chen et al., 2010; Ialongo, 2016), suggests that for every 3 months older, the probability of repair increases 1.”
MethodInfluentialAarhus, R. T., & Huang, E. (2020) · Patient Education and Counseling · doi:10.1016/j.pec.2020.03.011 · Cited by 11
Steluti, J., Miranda, A. M., Carli, E. D., Palchetti, C. Z., Fisberg, R. M., & Marchioni, D. M. L. (2020) · European Journal of Nutrition · doi:10.1007/s00394-020-02307-z · Cited by 10
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Choi, J., Kruis, N. E., & Lee, J. (2020) · Children and Youth Services Review · doi:10.1016/j.childyouth.2020.105392 · Cited by 10
Pushkar, S. (2020) · Applied Sciences · doi:10.3390/app10238737 · Cited by 10
Merkouris, S., Greenwood, C. J., Youssef, G. J., Letcher, P., Vassallo, S., Dowling, N. A., & Olsson, C. A. (2021) · Journal of Clinical Medicine · doi:10.3390/jcm10071406 · Cited by 10
“use and any-risk gambling in adulthood were notable [51].”
BackgroundHoffmire, C. A., Monteith, L. L., Denneson, L. M., Holliday, R. P., Park, C. L., Mazure, C. M., & Hoff, R. A. (2021) · Journal of Affective Disorders · doi:10.1016/j.jad.2021.07.015 · Cited by 10
Xu, S., Coffman, D. L., Liu, B., Xu, Y., He, J., & NIAURA, R. S. (2021) · Prevention Science · doi:10.1007/s11121-021-01326-4 · Cited by 11
“The greater an e-value (e.g., OR > 5 indicating a large effect size; Chen et al. 2010), the greater the unmeasured confounding would need to be to explain away an exposure effect, hence the more robust the estimated exposure effect against unmeasured confounding.”
Background
Metadata
- Authors
- Chen, H., Cohen, P., & Chen, S.
- Affiliations
- Winthrop-University Hospital (US)
- New York State Psychiatric Institute (US)
- Health Canada (CA)
- Corresponding author
- Chen, Henian
- Venue
- Communications in Statistics - Simulation and Computation
- Publisher
- Informa UK Limited
- Published
- 2010-03-31
- Volume
- 39
- Issue
- 4
- Pages
- 860-864
- ISSN
- 0361-0918 (ISSN-L)
- 1532-4141
- OpenAlex
- W2029059557
- Cited by
- 1,952
- References
- 20
- Citations by year
- 2026: 170 · 2025: 201 · 2024: 259 · 2023: 234 · 2022: 254 · 2021: 242 · 2020: 196 · 2019: 123 · 2018: 93 · 2017: 65 · 2016: 44 · 2015: 31 · 2014: 18 · 2013: 11 · 2012: 4
- FWCI
- 5.45
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Communications in Statistics - Simulation and Computation (publishedVersion)
- Topics
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Epidemiology
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Clinical Trials
- Keywords
- odds ratio, effect size interpretation, Cohen's d, standardized mean difference, disease incidence
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