Shankar 2010.

Methods	Study: prospective randomised. Allocation: sealed envelope. Blinding: No
Participants	334 patients: 172 P / 162 C.
Interventions	Hernioplasty ATB: cefazolin 1 gr IV. MA: induction. Control: sterile saline.
Outcomes	IP=12; IC=17
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "...were randomised into antibiotic group and control group by sealed envelope method on the day before the surgery." Comment: Yes
Allocation concealment (selection bias)	High risk	Comment: Randomization on the day before the surgery. Probably not.
Blinding (performance bias and detection bias) All outcomes	High risk	Not mentioned. Comment: Probably not.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not mentioned. Comment: Probably not.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Quoted: "Follow was done by residents who where blinded to the drug used."