Table 1.

Characteristics of studies included in the meta-analysis of antibiotic vs placebo after chest drain insertion

Reference	Year	Country	Sample size	Injury type	Antibiotic	Duration
Grover13	1977	USA	75	Penetrating	Clindamycin 300 mg six hourly	>24 hours
Stone6	1981	USA	83	Penetrating, blunt	Cefamandole 1 g six hourly	>24 hours
LeBlanc5	1985	USA	52	Penetrating, blunt	Cefadyl 1 g	>24 hours
Mandal14	1985	USA	80	Penetrating	Doxycycline 100 mg 12 hourly	>24 hours
LoCurto15	1986	USA	58	Penetrating, blunt	Cefoxitin 1 g six hourly	>24 hours
Brunner20	1990	USA	90	Penetrating, blunt	Cefazolin six hourly	>24 hours
Cant16	1993	South Africa	113	Penetrating	Cefazolin 500 mg eight hourly	24 hours
Nichols19	1994	USA	119	Penetrating, blunt	Cefonicid 1 g per day	>24 hours
Gonzalez17	1998	USA	139	Penetrating, blunt	Cefazolin 1 g eight hourly	>24 hours
Maxwell7	2004	USA	224	Penetrating, blunt	Cefazolin 1 g eight hourly	≥24 hours
Villegas Carlos18	2009	Mexico	126	Penetrating, blunt	Cefazolin 1 g eight hourly	>24 hours
Heydari12	2014	Iran	104	Blunt	Cefazolin 2 g	24 hours