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Table 1 Baseline characteristics and subdistribution hazard ratio (SHR) for P. aeruginosa ICU pneumonia

From: P. aeruginosa colonization at ICU admission as a risk factor for developing P. aeruginosa ICU pneumonia

  N (%) or mean (SD) SHR (95 % CI) p
Gender: femalea 1915 (37.6) 0.73 (0.43–1.24) 0.24
Ageb 59.4 (16.1) 0.99 (0.98–1.01) 0.43
Length of stay in days 9.1 (11.7) - -
 Median 5.0   
Medical admissionc 2176 (42.7) 1.34 (0.82–2.20) 0.24
Colonization status at ICU admission
 - PA – 2221 (43.6) ref ref
 - PA + 226 (4.4) 8.84 (4.96–15.74) <0.001 *
 - Unknown/missing 2645 (51.9) 1.04 (0.58–1.86) 0.89
ICU mortality 691 (13.6) - -
Mechanical ventilation at ICU admission 2591 (50.9) 5.2 (2.70–10.47) <0.001 *
ICU pneumonia 675 (13.3) - -
 - PA 68 (1.3)   
 - other confirmed pathogen 347 (6.8)   
 - unknown pathogen 260 (5.1)   
  1. amale gender is reference category, bSHR per extra year of age, csurgical admission is reference category
  2. *significant at the 0.05 level
  3. - = not measured/not applicable