画像 odds ratio vs relative risk case-control study 159496-Odds ratio relative risk case control study

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Odds vs Risk=probability Cohort Studies (risk ratio) Hypothetical Data CaseControl Studies (odds ratio) Disease (Cases) Casecontrol study example You sample 50 stroke patients and 50 controls without stroke and ask about their smoking in the pastIt turns out that odds ratio can be an approximation of the relative risk when the latter cannot be calculated For example In casecontrol studies when the risk of a disease cannot be known When we use certain statistical methods (like logistic regression) that output results directly in the form of odds ratios

Odds ratio relative risk case control study

Odds ratio relative risk case control study-I understand that odds ratio is the ratio is the odds of two groups (ie positive outcomes/negative outcomes), where as relative risk is the ratio of risk of two groups (ie positive outcomes/all outcomes)Could someone explain why odds ratios are used in case control studies where as relative risk is used in RCT and cohort studies?

What Is An Odds Ratio And How Do I Interpret It Critical Appraisal

A relative risk of 1 says the tutoring made no difference at all If it's above 1, then the tutored group actually had a higher risk of failing than the controls Odds Ratios The odds ratio is the ratio of the odds of an event in the Treatment group To understand why the risk ratio is not appropriate in the Knoll's study, we consider the example reported in Figure 1, showing that, unlike the OR, the risk ratio among others depends on the number of controls taken for each caseAs shown in Figure 1 (left panel), the risk ratio for arteriovenous fistula thrombosis results to be 65% higher (risk ratio=165) in patients with Show activity on this post In a casecontrol study, it is said that we can approximate relative risk (RR) by odds ratio (OR) when the disease is rare O R = p 1 1 − p 1 p 2 1 − p 2 = p 1 p 2 1 − p 2 1 − p 1 = R R 1 − p 2 1 − p 1 But there is one thing that I do not understand

When the risk ratio cannot be obtained directly (such as in a casecontrol study), the odds ratio is calculated and often interpreted as if it were the risk ratio Subsequently, the term relative risk commonly refers to either the risk ratio or the odds ratio However, only under certain conditions does the odds ratio approximate the risk ratio Figure 1 shows that when the Relationship between odds ratio and relative risk at various levels of baseline risks in the control group (I 0 = 05, 03, 02, 01, 005, and 001)1 I 0, baseline risk of control group Table 2 Comparison of risk difference, risk ratio, and odds ratio based on risks (p) and odds of two competitive groups (assume n = 1,000 per group)• Rate ratio (relative risk) = incidence exposed / incidence unexposed RR = (A 1/T 1) / (A 0/T 0) In casecontrol studies, neither exposed nor unexposed person time (T 1, T 0) are directly measured Odds Ratio in Incidence Density CaseControl Studies Disease DiseaseFree PersonTime Exposed (1) A1 B1 T1 Unexposed (0) A0 B0 T0

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The relative risk is a ratio of two incidence rates or two mortality rates and is an estimator of the excess risk among exposed as compared to nonexposed or less exposed It is the standard wayAlthough the odds ratio approximates the risk ratio if the outcome risk is sufficiently low for all study subjects, when some of the subjects have risk higher than 10%, the odds ratio is known to

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