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Table 3 Healthcare resource utilization for ICU patients with S. aureus or P. aeruginosa pneumonia versus controls during index hospitalization

From: Healthcare utilization and costs associated with S. aureus and P. aeruginosa pneumonia in the intensive care unit: a retrospective observational cohort study in a US claims database

  Cohorts of interest S. aureus pneumonia vs No pneumonia P. aeruginosa pneumonia vs No pneumonia
No pneumonia S. aureus pneumonia P. aeruginosa pneumonia Odds Ratio/Differencea P Valuea Odds Ratio/Differenceb P Valueb
(95 % CI) (95 % CI)
N = 201,394 N = 2275 N = 1007
Mean (SD) length of hospital stay per patient 7.2 (9.6) 37.9 (39.4) 55.4 (54.9) 30.69 (29.41, 32.00) <.001 48.18 (45.43, 51.08) <.001
Mean (SD) length of ICU/CCU stay per patient 1.1 (2.1) 6.9 (21.1) 14.8 (36.6) 5.75 (5.59, 5.91) <.001 13.63 (13.21, 14.06) <.001
No. (%) of patients with mechanical ventilation 14,960 (7.4) 1,425 (62.6) 627 (62.3) 20.89 (19.16, 22.78) <.001 20.56 (18.08, 23.38) <.001
  1. CI confidence interval, ICU intensive care unit
  2. aOdds ratio (OR) from Chi-square test is used for categorical variables, negative binomial models are used to test for differences between means for count variables (number of events and length of stay). Statistical comparisons are comparing Cohort 3 (pneumonia due to S. aureus) with Cohort 1 (no pneumonia, reference group); ie, Difference = mean (Cohort 3) − mean (Cohort 1) and OR = Odds (Cohort 3)/Odds (Cohort 1)
  3. bOdds ratio (OR) from Chi-square test is used for categorical variables, negative binomial models are used to test for differences between means for count variables (number of events and length of stay). Statistical comparisons are comparing Cohort 4 (pneumonia due to P. aeruginosa) to Cohort 1 (no pneumonia, reference group); ie, Difference = mean (Cohort 4) – mean (Cohort 1) and OR = Odds (Cohort 4)/Odds (Cohort 1)