134 Chapter 6 Estimate (95% CI) P value Baseline season 1 ILI season- P/F day 1 -3.0 (-9.8 to 3.8) 0.38 ILI season- P/F day 3 15.8 ( -8.2 to 39.7) 0.20 ILI season- P/F day 7 -10.1 (-74.5 to 54.3) 0.75 Supplementary Table 6. Multivariable linear regression analysis with the P/F ratio on 3 different days as the outcome variables and age, sex, BMI, ACEFII, type of surgery, year of surgery, ILI season, CCI, ICU occupancy rate and hospital type (academic/ non-academic), ICU occupancy rate as predictor variables Supplementary Figure 1. Results from a Cox regression analysis, showing the hazard ratio of stopping IMV in ILI season compared to baseline season for different years. ILI season, year of surgery, age, sex, BMI, type of surgery, CCI, ACEFII, hospital type and ICU occupancy rate were included as predictor variables
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