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Table 1 Univariate analysis of characteristics and parameter of cases and controls

From: Prolonged outbreak of clonal MDR Pseudomonas aeruginosa on an intensive care unit: contaminated sinks and contamination of ultra-filtrate bags as possible route of transmission?

Parameter

Cases (n = 21)

Controls (n = 21)

p-value

P. aeruginosa infection; % (n)

42.9 (9)

52.4 (11)

0.758

MDR P. aeruginosa colonization; % (n)

100% (21)

42.9 (9)

<0.001

SAPS II total (95%Confidence Interval [CI])

50 (37–59)

44 (31–50)

0.147

Colonization site; % (n)

Tracheobronchial secretion

42.9 (9)

57.1 (12)

 

Intraabdominal swab

9.5(2)

9.5 (2)

 

Rectal

28.6 (6)

-

 

Wound swab

9.5 (2)

-

 

Urine

38.1 (8)

28.6 (6)

 

Blood

-

4.8 (1)

 

Stay in a room with colonized sink; % (n)

66.7 (14)

28.6 (6)

0.062a

Contact with MDR colonized patient; % (n)

14.3 (3)

-

 

All drainages; % (n)

42.9 (9)

61.9 (13)

0.751

Dialysis or hemofiltration

33.3 (7)

4.8 (1)

0.045a

Gastric tube

95.2 (20)

85.7 (18)

0.606

Urinary catheter

100.0 (21)

100.0 (21)

1.000

Tracheal cannula

38.1 (8)

33.3 (7)

1.000

Central venous catheter

90.5 (19)

85.7 (18)

1.000

Leukopenia

14.3 (3)

14.3 (3)

1.000

Immunosuppression

38.1 (8)

9.5 (2)

0.067a

Septic chock

19.0 (4)

28.6 (6)

0.719

Surgery patient

85.7 (18)

90.5 (19)

1.000

Neurosurgery patient

14.3 (3)

23.8 (5)

0.697

Age (years)

71.0 (55.2–78.1)

75.5 (63.4–83.4)

0.120

LOS before colonization (days)

16 (11–34)

10 (5–28)

0.190

Length of stay overall (days)

38 (23–54)

30 (10–46)

0.170

Stay in single room (days)

0 (0–5)

0 (0–9)

1.000

Stay in shared room (days)

12 (6–30)

4 (0–16)

0.031a

Penicillin; % (n)

42.9 (9)

23.8 (5)

0.362

Cephalosporin; % (n)

42.9 (9)

23.8 (5)

0.362

Carbapenem; % (n)

42.9 (9)

28.6 (6)

0.520

Quinolone; % (n)

52.4 (11)

23.8 (5)

0.111

Aminoglycoside; % (n)

28.6 (6)

4.8 (1)

0.093a

Glycopeptide; % (n)

28.6 (6)

19.0 (4)

0.719

Antibiotic inhalation; % (n)

33.3 (7)

9.5 (2)

0.130

  1. Continuous data is displayed as median (interquartile range) and categorial data as percentage (number)
  2. SAPS Simplified Acute Physiology Score (score for the severity of disease), LOS length of stay
  3. aparameter was included in the multivariable regression analysis