Kandil 2014.

Methods	Randomized controlled trial.
Participants	100 primigravid women with singleton pregnancy at term undergoing elective cesarean. Excluded: age < 20 or > 30 years; BMI < 19 or >= 25; exposure to antibiotics within 1 week of delivery; premature rupture of membranes; indication for emergency cesarean; hypersensitivity to cephalosporins; temperature > 37.8 degrees celsius.
Interventions	2 g cefazolin administered 30 minutes preoperatively (n = 50) versus after cord clamp (n = 50).
Outcomes	Endometritis, wound infection, UTI.
Notes	1 hospital in Egypt. June 2011‐December 2012.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	50 cards were prepared for each intervention. The cards were placed into opaque envelopes and "shuffled to produce a form of random assignment".
Allocation concealment (selection bias)	Low risk	Sequentially numbered opaque envelopes.
Blinding of participants and personnel (performance bias) All outcomes	High risk	This was not specified, but we suspect that no blinding occurred.
Blinding of outcome assessment (detection bias) All outcomes	High risk	This was not specified, but we suspect that no blinding occurred.
Incomplete outcome data (attrition bias) All outcomes	Low risk	None reported.
Selective reporting (reporting bias)	Low risk	Prespecified outcomes stated.
Other bias	Low risk	No other bias evident.