Stoller 1965.

Methods	Randomised controlled trial. Randomisation by random cards. Triple‐blinded.
Participants	84 enrolled in the study. Patients who were given systemic antibiotic immediate postoperatively were excluded after randomisation.
Interventions	Treatment group: Polybactrim spray, topical after closure of peritoneum. Placebo group: Not specified, regime as above.
Outcomes	Woundinfection (An inflammatory erythema in clear excess of normal healing process or if serum or pus discharged from the wound).
Notes	No drain treatment.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	A ‐ Adequate