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Table 4 Factors associated with ventilator-associated pneumonia by multivariate analysis

From: Hyperoxemia as a risk factor for ventilator-associated pneumonia

Variables P OR (95 % CI)
Model 1   
 SAPS II 0.019 1.01 (1.00, 1.02)*
 Red blood cell transfusion 0.009 1.75 (1.14, 2.70)
 Proton pump inhibitor use 0.040 1.86 (1.03, 3.39)
 Number of days with hyperoxemia 0.001 1.10 (1.04, 1.16)**
Model 2   
 SAPS II 0.017 1.01 (1.00, 1.02)*
 Red blood cell transfusion 0.009 1.79 (1.16, 2.78)
 Proton pump inhibitor use 0.031 1.92 (1.06, 3.50)
 MV duration prior to VAP 0.012 1.10 (1.01, 1.04)**
 Hyperoxemia at ICU admission 0.004 1.89 (1.23, 2.89)
Model 3   
 Red blood cell transfusion 0.018 1.71 (1.10, 2.65)
 Proton pump inhibitor use 0.017 2.10 (1.14, 3.79)
 MV duration prior to VAP 0.005 1.03 (1.01, 1.04)*
 Percentage of days with hyperoxemia 0.029 2.20 (1.08, 4.48)**
  1. SAPS simplified acute physiology score; MV mechanical ventilation, VAP ventilator-associated pneumonia. Model 1: *per point of SAPS II, **per day with hyperoxemia; Hosmer-Lemshow goodness-of-fit, p = 0.62. Other non-significant variables included in the model: transfer from other wards, shock, sedation, and duration of MV prior to VAP. Model 2: *per point of SAPS II, **per day of mechanical ventilation; Hosmer-Lemshow goodness-of-fit, p = 0.81. Other non-significant variables included in the model: transfer from other wards, shock, and sedation. Model 3: *per day of mechanical ventilation, **per centile of days with hyperoxemia; Hosmer-Lemshow goodness-of-fit, p = 0.78. Other non-significant variables included in the model: SAPS II, transfer from other wards, shock, and sedation