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Table 4 Multivariable regression models investigating risk factors for ICU mortality in ARDS patients

From: Effect of mechanical power on intensive care mortality in ARDS patients

ICU mortality

RR

95% CI

p

ICU mortality

RR

95% CI

p

Age (with each 1-year increase)

1.01

1.00 - 1.02

0.041

Age (with each 1-year increase)

1.01

1.01- 1.02

0.024

SAPS II (with each 1-point increase)

1.01

1.00 - 1.02

0.004

SAPS II (with each 1-point increase)

1.01

1.01- 1.02

0.007

100 < PaO2 / FiO2 ≤ 200

1.47

0.74 - 2.94

0.274

100 < PaO2 / FiO2 ≤ 200

1.32

0.66- 2.64

0.438

PaO2 / FiO2 ≤ 100

2.95

1.48 - 5.89

0.002

PaO2 / FiO2 ≤ 100

2.80

1.40- 5.56

0.003

Transpulmonary MP_PBW (J/min/Kg)

1.68

0.48 - 5.93

0.419

Transpulmonary

MP_well inflated tissue(J/min/g)

3.01

1.15- 7.91

0.025

ICU mortality

RR

95% CI

p

ICU mortality

RR

95% CI

p

Age (with each 1-year increase)

1.01

1.00 - 1.03

0.024

Age (with each 1-year increase)

1.01

1.00 - 1.03

0.019

SAPS II (with each 1-point increase)

1.01

1.00 - 1.02

0.008

SAPS II (with each 1-point increase)

1.01

1.00 - 1.02

0.009

100 < PaO2 / FiO2 ≤ 200

1.44

0.72 - 2.88

0.300

100 < PaO2 / FiO2 ≤ 200

1.31

0.65 - 2.63

0.444

PaO2 / FiO2 ≤ 100

2.85

1.42 - 5.70

0.003

PaO2 / FiO2 ≤ 100

2.78

1.39 - 5.54

0.004

Transpulmonary

MP_CRS (J/min/mL/cmH2O)

1.74

1.11 - 2.70

0.015

Transpulmonary

MP_lung gas volume (J/min/g)

1.00

0.99 - 1.01

0.157

  1. Relative risk (RR) and 95% confidence intervals (CI) of intensive care unit (ICU) mortality calculated with multivariable Poisson regression models with robust standard error
  2. Effects of age (years), SAPS II (reference: SAPS II simplified acute physiology score), ARDS severity (PaO2/FiO2; reference > 200), transpulmonary mechanical power normalized to predicted body weight (Transpulmonary MP_PBW), transpulmonary mechanical power normalized to well inflated tissue (Transpulmonary MP_well inflated tissue), transpulmonary mechanical power normalized to respiratory system compliance (Transpulmonary MP_CRS), transpulmonary mechanical power normalized to lung gas volume (Transpulmonary MP_lung gas volume)