How do you interpret incidence ratio?
IRR Equal to 1: This indicates that the incident rate is equal among those in an exposed group and those in an unexposed group. For example, if smokers developed lung cancer at a rate of 7 per 100 person-years and non-smokers developed lung cancer at a rate of 7 per 100 person-years, then the IRR would be 7/7 = 1.
What does cumulative incidence rate mean?
Cumulative incidence is calculated as the number of new events or cases of disease divided by the total number of individuals in the population at risk for a specific time interval. Researchers can use cumulative incidence to predict risk of a disease or event over short or long periods of time.
What does a risk ratio of 1.5 mean?
You interpret an odds ratio the same way you interpret a risk ratio. An odds ratio of 1.5 means the odds of the outcome in group A happening are one and a half times the odds of the outcome happening in group B.
What does a relative risk of 0.3 mean?
An RR that is greater than 1.00 means that the risk is increased in the exposed sample. 3. An RR of, say, 0.3 can be expressed in plain English in many ways. However, RR values that are closer to 1.00 can also be considered clinically significant if the event is serious or if it is important to public health.
How do you interpret a rate ratio less than 1?
A risk ratio greater than 1.0 indicates an increased risk for the group in the numerator, usually the exposed group. A risk ratio less than 1.0 indicates a decreased risk for the exposed group, indicating that perhaps exposure actually protects against disease occurrence.
What does a risk ratio of 0.75 mean?
2c) A risk ratio of 0.75 means there is an inverse association, i.e. there is a decreased risk for the health outcome among the exposed group when compared with the unexposed group. The exposed group has 0.75 times the risk of having the health outcome when compared with the unexposed group.
What does cumulative rate mean?
Cumulative interest is the sum of all interest payments made on a loan over a certain period. On an amortizing loan, cumulative interest will increase at a decreasing rate, as each subsequent periodic payment on the loan is a higher percentage of the loan’s principal and a lower percentage of its interest.
Is cumulative incidence the same as prevalence?
Prevalence and incidence are frequently confused. Prevalence refers to proportion of persons who have a condition at or during a particular time period, whereas incidence refers to the proportion or rate of persons who develop a condition during a particular time period.
What does a risk ratio of 1 mean?
A risk ratio of 1.0 indicates identical risk among the two groups. A risk ratio greater than 1.0 indicates an increased risk for the group in the numerator, usually the exposed group.
Is an odds ratio of 1.5 high?
The odds ratio also shows the strength of the association between the variable and the outcome. Simply put, an odds ratio of 5 (i.e. 5 times greater likelihood) shows a much stronger association than odds ratio of 3, which in turn is stronger than an odds ratio of 1.5.
What does a relative risk of 2.8 mean?
Clinical Significance Thus relative risk provides an increase or decrease in the likelihood of an event based on some exposure. Relative risk has the benefit of being a ratio of risks which means it can be applied to populations with differing disease prevalence.
What does a RR of 10.5 mean?
What does a RR of 10.5 mean? A. Those with the disease have a 10.5 greater odds of having the exposure of interest in their history than those without the disease.