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HR > 1: The treatment group experiences a higher event probability within any given period than the control group. HR < 1: The treatment group experiences a lower event probability during a unit of time than the control group. Applications : RR is commonly used in prospective studies such as cohort studies.
The disadvantage of it is the RR is not a constant effect of X. Only the odds ratio is. The probability ratio changes depending on the value of X. So if you want to know how X affects Y, odds ratios are the best summary measure. Reply. Shamel Addas says. April 17, 2018 at 10:15 pm.
Relative risk can be directly determined in a cohort study by calculating a risk ratio (RR). In case-control studies, and in cohort studies in which the outcome occurs in less than 10% of the unexposed population, the OR provides a reasonable approximation of the RR. However, when an outcome is common (iY 10% in the unexposed group), the OR ...
相对危险度RR （relative risk）、风险比HR（ hazard ratio ）、比值比OR（odds ratio），以上三个"R"值在临床研究领域有着广泛的应用，但对于不少临床新手来说，一看见这三个概念就容易搞混，更别提真正理解它们背后的涵义了。 因此，小编就来和大家一起谈谈如何正确理解并使用它们。
relationship between RR and OR for some probabilities of the outcome. 3 Relation between RR and HR If one searches the Internet for the relation between the hazard ratio and the relative risk, one will one will predominantly find statements that tell us that these two statistics are more or less equal (Nurminen, 1995).
The ENSO exposure is considered neutral when the measurable values range from −0.5 to 0.5. As deaths are usually considered rare events, HR and relative risk (RR) were assumed to be a reasonable ...
Relative risks (RR) are similar to odds ratios, however the way they are calculated are different. Using the above example, Table 1, we can calculate the relative risk. The formula for relative risk is \[ RR = (87/263) / (101/248) = 0.33/0.407 = 0.81 \] Again, this means that men with a heart condition have a decreased risk compared to women.
Finally, regardless of the valu e of the HR/RR/OR statistic, an interp retation should only be. made after determining whe ther the result provides statistically sig nificant evidence towards a.
Finally, regardless of the value of the HR/RR/OR statistic, an interpretation should only be made after determining whether the result provides statistically significant evidence towards a conclusion (as determined by the p-value or confidence interval). Remembering these principles and the framework of HR/RR/OR minimizes misrepresentation and ...
Three effect measures—hazard rate ratio (HR), relative risk (RR), and odds ratio (OR)—are examined in this article, and are summarized by five descriptive features in Table 1.In 1951, Cornfield [5] introduced relative risk and derived its odds ratio approximation for case-control studies involving rare diseases. The hazard rate ratio has a long history in actuarial statistics ...