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Table 1 Descriptive characteristics of cases with ICU-acquired LRTI and control patients without LRTI

From: Attributable costs of ventilator-associated lower respiratory tract infection (LRTI) acquired on intensive care units: a retrospectively matched cohort study

Characteristic

Cases (N = 49)

Controls (N = 49)

P-value*

SAPS II†

48 (36–64)

50 (38–61)

0.535

Age†

63 (53–75)

63 (54–75)

0.455

Males †

30 (62%)

30 (62%)

1.000

Time with mechanical ventilation (h)

444 (182–682)

84 (0–304)

<.001

  Surgical ICU

37 (76%)

23 (47%)

0.005

  Medical ICU

6 (12%)

16 (33%)

  Interdisciplinary ICU

6 (12%)

10 (20%)

In-house mortality

14 (29%)

2 (4%)

0.002

Charlson comorbidity index

7 (4–8)

5 (3–8)

0.350

Myokardial infarct

3 (6%)

0 (0%)

0.250

Congestive heart failure

24 (49%)

19 (39%)

0.359

Peripheral vascular disease

11 (22%)

5 (10%)

0.109

Cerebrovascular disease

23 (47%)

16 (33%)

0.265

Dementia

2 (4%)

1 (2%)

1.000

Chronic lung disease

11 (22%)

9 (18%)

0.791

Connective tissue disease

1 (2%)

0

1.000

Peptic ulcer

0

1 (2%)

1.000

Mild liver disease

6 (12%)

6 (12%)

1.000

Diabetes without complications

12 (25%)

8 (16%)

0.388

Diabetes with complications

2 (4%)

2 (4%)

1.000

Renal disease

25 (51%)

14 (29%)

0.027

Tumour

5 (10%)

13 (27%)

0.057

Moderate or severe liver disease

4 (8%)

5 (10%)

1.000

Malignant tumour

2 (4%)

6 (12%)

0.219

AIDS

0

1 (2%)

1.000

Hemiplegia

16 (33%)

8 (16%)

0.096

Leukemia

1 (2%)

0

1.000

Lymphoma

0

0

1.000

  1. SAPS II, simplified acute physiology score; AIDS, acquired immunodeficiency syndrome; LOS, length of hospital stay in days.
  2. Values are given as number (%) or median (interquartile range).
  3. * Wilcoxon signed-rank test for continuous variables and McNemar’s test for binary variables.
  4. † Matching criteria. Additional matching criteria were: discharge within 2010 and a length of stay at least as that of cases before onset of LRTI.