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| Total antibiotics+no antibiotics | Received antibiotics | No antibiotics | P-value | |
| All first episodes | 123/137 (90%) | 90/90 (100%) | 33/47 (70%) | p<0.0001 |
| Minor surgery | 53/59 (90%) | 30/30 (100%) | 23/29 (79%) | p = 0.01 |
| Major surgery | 70/78(90%) | 60/60 (100%) | 10/18 (56%) | p<0.0001 |
| Negative margins | 64/68 (94%) | 35/35 (100%) | 29/33 (88%) | p = 0.05 |
| Positive margins | 59/69 (86%) | 55/55 (100%) | 4/14 (29%) | p<0.0001 |
