Walss Rodriguez 1990.

Methods	RCT; 2 parallel groups. Unit of randomization: individual.
Participants	Dates of data collection: July 1 to September 1988. Setting: Coah, Mexico. Inclusion criteria: women undergoing urgent CS. N = 120. Exclusion: fever, chorioamnionitis, penicillin allergy, antibiotic treatment in prior 2 weeks.
Interventions	Intervention: ampicillin 2 g IV every 4 hrs x 3 after clamping of cord; N = 59. Comparison: no treatment: no treatment; N = 61.
Outcomes	Febrile syndrome; wound infection; abdominal wall abscess; endometritis, length of hospital stay.
Notes	No definitions of outcomes provided. "Absceso de pared" has been translated as abdominal wall abscess. Abdominal wall abscess, infection of surgical scar and spontaneous reopening of the wound + infection have been classified as "wound infection". Class of antibiotic: aminopenicillin (ampicillin). Subgroups: type of CS unclear; after cord clamping.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: Allocated "in random form" using a random table.
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. Analysis appears to be ITT.
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.