Absolute and relitive dating
They followed these physicians for about five years.
Some of the data is summarized in the 2x2 table shown below.
Relative Risk values are greater than or equal to zero.
A value of 1 indicates a neutral result: the chance of an event occurring for one group is the same for an event occurring for the other group.
The table below shows how the risk ratio was calculated in the study examining the risk of wound infections when an incidental appendectomy was done during a staging laparotomy for Hodgkin disease.
It is also possible for the risk ratio to be less than 1; this would suggest that the exposure being considered is associated with a reduction in risk.Frequently, the term "relative risk" is used to encompass all of these.