Gerstner 1980.

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. N = 103.
Interventions	Intervention: metronidazole 500 mg IV before induction of anesthesia and 12 and 24 hrs post‐operatively, then rectal suppository x 4 days; N = 53. Comparison: no treatment: no treatment; N = 50.
Outcomes	Fever (> 38oC 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
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "...randomized...". Comment: no description of sequence generation process and no further details provided in translation.
Allocation concealment (selection bias)	Unclear risk	Comment: no information provided.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comment: no losses or exclusions were reported; appears to be an ITT analysis.
Selective reporting (reporting bias)	Unclear risk	Comment: insufficient information to judge.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Comment: no blinding; not placebo‐controlled.
Blinding of outcome assessment (detection bias) All outcomes	High risk	Comment: probably outcome assessment was not blinded.
Other bias	Low risk	Comment: no other sources of bias identified.