Lazorthes 1992.

Methods	Study: prospective, randomised. Allocation: NM. Blinding: no.
Participants	308 patients: 155 P / 153 C.
Interventions	Herniorrhaphy ATB: cefamandole 750 mg subcutaneous. MA: added to local anaesthesia. Control: no treatment.
Outcomes	IP= 0; IC= 7
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Two groups of 162 patients were randomly allotted to receive ..." Information not provided.
Allocation concealment (selection bias)	High risk	Not mentioned. Comment: Probably not done.
Blinding (performance bias and detection bias) All outcomes	High risk	Not mentioned. Comment: Probably not done.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not mentioned. Comment: Probably not done.
Blinding of outcome assessment (detection bias) All outcomes	High risk	Not mentioned. Comment: Probably not done.