Winslow 1983.

Methods	Randomised controlled trial. Randomisation by the last number in the patients birthday. Triple‐blinded.
Participants	147 eligible patients. 44 excluded after randomisation. 103 enrolled in the study. Age‐range 4‐67. Mean 22. Patients receiving antibiotics 72 hours prior of surgery, had allergy to cephalosporins or penicillin, had impaired renal function and serious underlying disease, were excluded before randomisation
Interventions	Treatment group: Cefoxitin 1 g (children 20‐40 mg/kg/dose) IV peroperatively and 6 and 12 hours postoperatively. Placebo group: Saline regime as above.
Outcomes	Wound infection (Not defined). Postoperative intra abdominal abscess (Not defined) Length of stay in hospital
Notes	No drain treatment.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate