Methods	Randomized trial; 2 parallel groups.
	Unit of randomization: individual.
Participants	Dates of data collection: August 1979 and April 1980.
	Setting: Universitats-Frauenklinik Wien, Austria.
	Inclusion criteria: women undergoing CS.
Interventions	IV metronidazole 500 mg before induction of anesthesia and 12 and 24 hours post-operatively, then rectal suppository × 4 days (N = 53) vs no treatment (N = 50)
Outcomes	Fever (> 38°C on 2 subsequent days); wound infection; endometritis; additional use of antibiotics (treatment 13/53 vs control 22/50); maternal hospital days
Notes	Full translation pending.
	Class of antibiotic: Nitroimidazole (metronidazole).
	Subgroups: type of CS unclear; before cord clamping.
Risk of bias
Item	Authors’ judgement	Description
Adequate sequence generation?	Unclear	“…randomized…’ (no further details provided in translation)
Allocation concealment?	Unclear	No information provided.
Blinding?	Unclear	Not placebo-controlled.
All outcomes
Incomplete outcome data addressed?	Yes	No losses or exclusions were reported. It appears to be an ITT analysis
All outcomes
Free of selective reporting?	Unclear	Insufficient information to judge.
Free of other bias?	Unclear	Insufficient information to judge.
Overall low risk of bias?	Unclear	Mostly unclear.