[Retracted] Meta-Resolve of Risk Factors for Nosocomial Infection in Patients Undergoing Thoracic Surgery

Table 2

Nosocomial infection of patients undergoing thoracic surgery in a city hospital in two years.

Years	The first year	The second year	Total
Total number of operations	574	645	1219
Number of people infected	43	57	100
Infections	48	58	106
Inpatient bed days during the same period	11181	13934	25115
Average hospital stay	19.4	21.5	20.5
Occurrence density (‰)	4	4.2	4.1