1. Overview of treatment characteristics of the included herniorrhaphy studies.

	Antibiotic	Dose (g)	Administration route	Follow‐up period	Operative time (minutes); (mean ± SD or median (range))	Infection risk environment (Infection percentage in control group)	Remark
Andersen 1980	AMP	1	in fascia	1 m, 3 m, 6 m, 12 m	not reported	Low (4.0%)	Several surgery types performed
Evans 1973	CLR	1 (3×)	intravenous (1x)/ intramuscular (2x)	1 m	not reported	Low (4.1%)	Several surgery types performed
Lazorthes 1992	CAM	0.75	subcutaneous (added to local anaesthesia)	1 m	not reported	Low (4.6%)
Platt 1990	CON	1	intravenous	1 w, 4 to 6 w	PG: 75 ± 32 / CG: 75 ± 30	Low (1.9%)	Several surgery types performed
Taylor 1997	AMC	1.2	intravenous	4 to 6 w	not reported	High (8.9%)

PG = prophylactic group, CG = control group

AMC = Amoxicillin‐clavoulanic acid, AMP = ampicillin, CAM = cefamandole, CON = cefonicid, CLR = cephaloridine (Abbreviations according to EUCAST System for Antimicrobial Abbreviations)

w = week, m = month, y = year

Infection risk environment (L = low; ≤ 5% infections in control group for all wound infections (SSSI + DSSI), H = high; > 5% infections in control group for all wound infections (SSSI + DSSI) ).