Table 1.

Study characteristics (part 1)

Ref.	Country, clinical setting	Study years	Study design	N-SP definition (hours after admission)	N-SP/non N-SP
Song et al[20]	South Korea, University Hospital	1998-2003	RC	> 72	32/74
Cheong et al[21]	South Korea, University Hospital	2000-2007	RC	> 72	126/110
Fernández et al[22] (first cohort)	Spain, University Hospital	2005-2007	PC	> 48	32/94
Fernández et al[22] (second cohort)	Spain, University Hospital	2010-2011	PC	> 48	7/26
Chaulk et al[23]	Canada, University Hospital	2003-2011	RC	> 48	17/60
Li YT et al[24]	China, University Hospital	2011-2013	RC	> 48	99/207
Friedrich et al[25]	Germany, University Hospital	2007-2013	RC	> 48	89/49
Piano et al[12]	Italy, University Hospital plus Private Care Center	2011-2014	RCT	> 72	Only NSP, 31 cases
Salerno et al[26]	Italy, multicenter	2007-2009	PC	> 48	24/32
Lutz et al[27]	Germany, University Hospital	2012-2016	PC	> 48	63/29

N-SP: Nosocomial spontaneous peritonitis; RC: Retrospective cohort; PC: Prospective cohort; RCT: Randomized controlled trial.