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Table 3 Summarization of environmental screening data according to acquisition group

From: Pseudomonas aeruginosa acquisition on an intensive care unit: relationship between antibiotic selective pressure and patients' environment

  P. aeruginosa acquisition (n= 20) No P. aeruginosa acquisition (n= 106) Total (n= 126)
Cumulative patient-induced environmental pressure*    
From the same ward 1.2 (0.6 to 1.8) 0.8 (0 to 1.7) 1 (0.1 to 1.8)
From the ICU 4.8 (3.6 to 5.6) 4.7 (3.3 to 5.6) 4.7 (3.3 to 5.6)
Cumulative tap water-induced environmental pressure*    
From the patients' wards 0.1 (0 to 0.7) 0 (0 to 0.6) 0 (0 to 0.6)
From the ICU 1.9 (1.1 to 2.3) 1.6 (0 to 3) 1.8 (0 to 2.9)
From shared rooms 1 (0.7 to 2.3) 0.8 (0 to 1) 1 (0 to 1)
Patient-induced environmental pressure**    
≥1 colonized patient on the same ward    
   yes 20 79 99
   no 0 27 27
≥1 colonized patient on the ICU    
   yes 20 106 126
   no 0 0 0
Tap water-induced environmental pressure**    
≥1 colonized tap water on the same ward    
   yes 10 51 61
   no 10 55 65
≥1 colonized tap water on the ICU ¤    
   yes 18 68 86
   no 2 38 40
≥1 colonized tap water in shared rooms    
   yes 17 70 87
   no 3 36 39
  1. Values shown are: median (1st to 3rd quartile), or n.
  2. *Cumulative patient/tap water-induced environmental pressure represents the number of contaminated patients/tap water samples since admission.
  3. **Patient/tap water-induced environmental pressure represents the number of patient that were exposed to a contaminated patient/tap water at least one time during their ICU stay.
  4. ¤ Excluding tap water in shared rooms.