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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.
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.
Note that the "exposure" of interest was low-dose aspirin, and the aspirin group is summarized in the top row.
The group assigned to take aspirin had an incidence of 1.26%, while the placebo (unexposed) group had an incidence of about 2.17%.
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.Administration, Analysis and Reporting Statistics Solutions consists of a team of professional methodologists and statisticians that can assist the student or professional researcher in administering the survey instrument, conducting the analyses, and explaining the results.