Surgical site infections in Italian Hospitals: a prospective multicenter study

BMC Infectious Diseases

Table 1 Population and operation specific characteristics

Total number of patients Males (%)	4,665 1630 (34.9%)
	Mean	Median	Range
Age, years	53	54	(18; 99)
ASA score	2	2	(1;5)
Length of preoperative stay, days	2	1	(0; 69)
Length of postoperative stay, days	6	4	(0; 377)
Duration of intervention, hours	1.3	1	(0.2; 8.5)
NNIS index score	0	0	(-1*; 3)

-1 refers to interventions without risk factors for the NNIS index score, performed laparoscopically.
ASA = American Society of Anesthesiologists.
NNIS = National Nosocomial Infection Surveillance.

ISSN: 1471-2334