Reoperation for bleeding
One comparative study found that Witnesses were less likely to need reoperation for bleeding than the control group (3.7 vs 7.5%, p=0.01, respectively15). The other 6 studies that compared the two groups found no difference in this outcome44,47-51. Five non-comparative studies found the following percentages of patients requiring reoperation for bleeding: 043, 2.252, 54, 1057 and 11.4%53. Again, the different surgeries in the studies may account for the differences, but the results suggest a low risk of reoperation for bleeding in the Witness population.