What does a relative risk of 2 mean?
A relative risk or odds ratio greater than one indicates an exposure to be harmful, while a value less than one indicates a protective effect. RR = 1.2 means exposed people are 20% more likely to be diseased, RR = 1.4 means 40% more likely. OR = 1.2 means that the odds of disease is 20% higher in exposed people.
What does a relative risk of 3.0 mean?
Or if the relative risk were 3.0, people in Group A would be three times as likely as people from other groups to die from a cause. A relative risk that is less than 1.0 indicates that there is a lower risk among the people in Group A.
How do we calculate relative risk?
Relative Risk is calculated by dividing the probability of an event occurring for group 1 (A) divided by the probability of an event occurring for group 2 (B). Relative Risk is very similar to Odds Ratio, however, RR is calculated by using percentages, whereas Odds Ratio is calculated by using the ratio of odds.
What does a relative risk of 4 mean?
Say your absolute risk of developing a certain disease is 4 in 1,000. If a treatment reduces the relative risk by 50%, it means the 4 is reduced by 50%.
What does a relative risk of 0.6 mean?
In this hypothetical case, the RR is 0.6 (12 per cent ÷ 20 per cent = 0.6). When a treatment has an RR greater than 1, the risk of a bad outcome is increased by the treatment; when the RR is less than 1, the risk of a bad outcome is decreased, meaning that the treatment is likely to do good.
What does a relative risk of 0.3 mean?
An RR that is less than 1.00 means that the risk is lower in the exposed sample. 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.
What does a relative risk of 1.3 mean?
A relative risk of one implies there is no difference of the event if the exposure has or has not occurred. If the relative risk is greater than 1, then the event is more likely to occur if there was exposure. If the relative risk is less than 1, then the event is less likely to occur if there was exposure.
What does a relative risk of 5 mean?
If this baseline risk is high, then a relative risk of 5 would be alarming; if the baseline risk is small, then a relative risk of 5 may not be too serious.