How do you interpret population attributable risk percentage?
How do you interpret population attributable risk percentage?
Calculating the population attributable risk percent allows you to determine what percent of an outcome could possibly be prevented if a risk factor were to be removed from the population. To calculate the attributable risk, one simply subtracts the risk for the non-exposed group from the risk for the exposed group.
What is population attributable risk example?
Often, attributable risk is given as a percentage (called the attributable risk percent or AR%). For example, lung cancer has many causes, including smoking cigarettes and exposure to indoor radon. One study showed that the AR% for cigarette smoking and lung cancer was 85%.
How do you interpret population risk differences?
In general:
- If the risk ratio is 1 (or close to 1), it suggests no difference or little difference in risk (incidence in each group is the same).
- A risk ratio > 1 suggests an increased risk of that outcome in the exposed group.
- A risk ratio < 1 suggests a reduced risk in the exposed group.
What is the significance of attributable risk?
The attributable risk (AR) is the rate (proportion) of a health outcome (disease or death) in exposed individuals, which can be attributed to the exposure [2]. AR assesses how much greater in absolute terms the frequency of an outcome is among the exposed compared with the non-exposed [3].
What does a negative population attributable risk mean?
A positive RD value means increased risk and a negative one means decreased risk by the exposure. RR is calculated as the risk of an exposed group divided by the risk of an unexposed group.
Is population attributable risk a measure of association?
Difference Measures The attributable risk (AR) is a measure of association that provides information about the absolute effect of the exposure or excess risk of disease in those exposed compared with those unexposed, assuming that the risk is causal.
What does 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.
How do you calculate interpretation and risk difference?
The risk difference is calculated by subtracting the cumulative incidence in the unexposed group (or least exposed group) from the cumulative incidence in the group with the exposure. where (CIe) = cumulative incidence among the exposed subjects, and (CIu) is the cumulative incidence among unexposed subjects.
What does a risk ratio less than 1 mean?
decreased risk
Method for Calculating risk ratio 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 difference of 0 mean?
The “Null” Values The null value is to the measure of association when the incidence is the same in the groups being compared. If this is the case, the risk ratio = 1, the risk difference = 0, and the excess relative risk = 0.
How do you read a measure of association?
An OR equal to 1 indicates no association, an OR less than 1 suggests that the exposure is protective (exposure is less likely among the case group), and OR greater than1 suggests that the exposure is a risk factor (exposure is less likely among the control group).
What does a relative risk of 1.5 mean?
What relative risk tells us. A relative risk that is greater than 1.0 shows that there is an increased risk among the people in Group A. • This means if the relative risk was 1.5, people in Group A would be 50% more likely than people in all other groups to die from a cause.