Table will appear on the Web site: Distribution of surgical procedures and frequency of main type of surgery according to age group.

Surgical procedures and main types	Patients < 60 yrs n = 167	Patients 60 – 75 yrs n = 133	Patients > 75 yrs n = 106	P value
Orthopedic Hip Spine Femur	44 (26%) 14% 34% 34%	33 (25%) 70% 18% 3%	26 (24%) 61% 11% 4%	NS
Thoracic Lung resection	13 (8%) 61%	19 (14%) 95%	5 (5%) 40%	0.04
Vascular Abdominal aortic aneurysm Arterial bypass (aorto-iliac or femoral; femoropopliteal)	12 (7%) 42% 42%	23 (17%) 61% 22%	24 (23%) 21% 54%	0.001
Digestive Colorectal Gastrointestinal Esophagectomy	30 (18%) 30% 30% 10%	30 (23%) 40% 17% 13%	39 (37%) 49% 39% 2%	<0.0001
Urinary Nephrectomy Cystectomy/Prostatectomy	11 (7%) 45% 3%	20 (15%) 15% 40%	10 (9%) 60% 10%	NS
E.N.T.	7 (4%)	6 (4%)	2 (2%)	NS
Obstetric/Gynecologic	31 (18%)	0	0	<0.0001
Multiple trauma	19 (11%)	2 (1%)	0	<0.0001

Table will appear on the Web site. Main diagnostic categories leading to ICU admission*.

Diagnosis	Patients < 60 yr n, (%)	Patients 60 - 75 yr n, (%)	Patients > 75 yr n, (%)	Total n, (%)
Respiratory insufficiency after surgery	42, (25.0)	44, (33.0)	35, (33.0)	121, (30.0)
ARDS	7, (4.0)	9, (7.0)	0	16, (4.0)
Aspiration pneumonia	4, (2.0)	0	2, (2.0)	6, (1.5)
Trauma	44, (26.0)	4, (3.0)	3, (3.0)	51, (12.5)
Peritonitis	10, (6.0)	15, (11.0)	14, (13.0)	39, (10.0)
Bacterial pneumonia	2, (1.0)	5, (4.0)	2, (2.0)	9, (2.0)
Cholangitis	1 (0.5)	0	5, (5.0)	6, (1.5)
Other infections	1 (0.5)	2, (1.5)	1, (1.0)	4, (1.0)
Hemorrhagic shock or syndrome	13, (8.0)	12, (9.0)	6, (6.0)	31, (7.5)
GI bleeding	3, (2.0)	5, (4.0)	8, (7.5)	16, (4.0)
Undetermined shock	5, (3.0)	10, (7.5)	10, (9.0)	25, (6.0)
Anaphylactic shock	2, (1.0)	2, (1.5)	0	4, (1.0)
Cardiogenic shock or heart failure	3, (2.0%)	10, (7.5)	7, (6.5)	20, (5.0)
Other cardiac conditions	3, (2.0)	1, (1.0)	4, (4.0)	8, (2.0)
Renal diseases	5, (3.0)	3, (2.0)	2, (2.0)	10, (2.5)
Pyelonephritis	2, (1.0)	1, (1.0)	1, (1.0)	4, (1.0)
Neurologic disorders	6, (4.0)	3, (2.0)	1, (1.0)	10, (2.5)
GI perforation/obstruction	4, (2.0)	1, (1.0)	3, (3.0)	8, (2.0)
Pancreatitis	3, (2.0)	4, (3.0)	0	7, (2.0)
Table 3 (cont.)
Stab wound	5, (3.0)	1, (1.0)	0	6, (1 .5)
Miscellaneous	2, (1)	1, (1.0)	2, (2.0)	5, (1.0=

* Diagnoses were unevenly distributed between the 3 groups of patients (p<0.005).

Table will appear on the Web site: Distribution of microorganisms between older and younger infected patients*.

Microorganisms	Patients < 60 yr 54 infections 63 microorganisms	Patients 60 -75 yr 98 infections 114 microorganisms	Patients > 75 yr 40 infections 53 microorganisms
Gram positive cocci- species	24 (38.0%)	31 (27.0%)	15 (28.0%)
Staphylococcus aureus - number of methicillin-resistant	6 (10%) 2	14 (12.0%) 10	6 (11.0%) 3
Coagulase-negative staphylococci	11	7	5
Enterococcus species	6	4	3
Other Gram positive cocci sp.	1	6	1
Gram-negative bacilli species	36 (57%)	70 (61.0%)	32 (60.0%)
Escherichia coli	7 (11.0%)	16 (14.0%)	10 (19.0%)
Klebsiella sp.	3	5	3
Proteus mirabilis	1	7	1
Enterobacter cloacae	3	2	2
Other Enterobacteriaceae - number of ESBL Enterobacteriaceae	7 3	6 2	6 2
Pseudomonas aeruginosa - number of ticarcillin-resistant	9 (14.0%) 5	17 (15.0%) 9	8 (15.0%) 3
Acinetobacter baumanii - number of ticarcillin-resistant	0 -	7 6	0 -
Other Gram-negative bacilli.	6	10	2
Anaerobic pathogens	0	3	0
Candida spp	4 (6.0%)	10 (9.0%)	6 (11.0%)

* No significant differences in the frequency distribution of the various microorganisms isolated, or emergence of resistant bacteria were observed between the three groups. ESBL: extended-spectrum b-lactamase;