Table 1.

Characteristics of the hospitals studied: neurosurgery departments, patients, use of invasive devices, incidence per 100 hospitalizations and 1000 person-days from 2014 to 2019.

Characteristics of/Hospital/Unit/Patients	Hospital A	Hospital B	Total
Hospital description
Size (number of hospital beds)	620	530	1150
Infection Prevention Control Nurse (IPCN)–full-time employment	3	3	6
Hospital referral level	second	second	second
Characteristics of neurosurgical units
Number of neurosurgical beds	35	28	63
Number of neurosurgical intensive surveillance beds	5	3	8
Number of patients	8347	3770	12,117
Number of surgeries	7799	3507	11,306
Number of patient-days (pds) of hospitalization	68,008	34,729	92,737
Invasive device utilization ratio
Patient-days with urinary catheter	21,187	18,085	39,272
Urinary catheter UR *	0.31	0.4	0.36
Patient-days with central line catheter	5296	4000	9296
Central line catheter UR **	0.08	0.09	0.09
Patient-days with mechanical ventilation	580	379	959
Mechanical ventilation (MV) UR ***	0.01	0.01	0.01
Characteristics of patients
Patient age: Me/IQR, p < 0.001	57/45–68	64/42–76	62/50–71
Sex F/M, p = 0.129	0.7	0.5	0.6
Days of stay: Me/IQR, p < 0.001	22/10–40	32/22–52	28/17–47
Healthcare-associated infections (HAI)
Number of HAIs: OR (95% CI): 2.1 (1.73–2.58) p < 0.001	192	181	373
Incidence per 100 hospitalisations	2.3	4.8	3.1
Incidence density per 1000 pds	2.8	5.2	4.0

Person-days (pds) of hospitalization, standard deviation (SD), utilization ratio (UR), healthcare-associated infections (HAI), significance level (p), Odds Ratio (OR), 95% confidence interval (CI), median (ME), interquartile range (IQR), * patient-days/patient-days with urinary catheter, ** patient-days/patient-days with central vascular catheter, *** patient-days/patient-days with ventilation.