. 2020 May 24;24:246. doi: 10.1186/s13054-020-02963-x

Table 3.

Multivariable regression models investigating risk factors for ICU 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	0.038	Age (with each 1-year increase)	1.01	1.00 - 1.03	0.023
SAPS II (with each 1-point increase)	1.01	1.00 - 1.02	0.005	SAPS II (with each 1-point increase)	1.01	1.00 - 1.02	0.008
100 < PaO₂ / FiO₂ ≤ 200	1.41	0.71 - 2.82	0.325	100 < PaO₂ / FiO₂ ≤ 200	1.27	0.63 - 2.53	0.498
PaO₂ / FiO₂ ≤ 100	2.81	1.41 - 5.61	0.003	PaO₂ / FiO₂ ≤ 100	2.70	1.36 - 5.34	0.004
MP_PBW (J/min/Kg)	1.89	0.50 - 7.17	0.346	MP_well inflated tissue (J/min/g)	2.69	1.10 - 6.57	0.029
ICU mortality	RR	95% CI	p	ICU mortality	RR	95% CI	p
Age (with each 1-year increase)	1.01	1.00 - 1.02	0.022	Age (with each 1-year increase)	1.01	1.00 - 1.03	0.018
SAPS II (with each 1-point increase)	1.01	1.00 - 1.02	0.011	SAPS II (with each 1-point increase)	1.01	1.00 - 1.02	0.010
100 < PaO₂ / FiO₂ ≤ 200	1.38	0.69 - 2.75	0.359	100 < PaO₂ / FiO₂ ≤ 200	1.26	0.63 - 2.53	0.506
PaO₂ / FiO₂ ≤ 100	2.71	1.36 - 5.42	0.005	PaO₂ / FiO₂ ≤ 100	2.68	1.35 - 5.32	0.005
MP_CRS (J/min/mL/cmH2O)	1.79	1.16 - 2.76	0.008	MP_lung gas volume (J/min/mL)	1.00	0.99 - 1.01	0.177

Relative risk (RR) and 95% confidence intervals (CI) of intensive care unit (ICU) mortality calculated with multivariable Poisson regression models with robust standard error

Effects of age (years), SAPS II (reference: SAPS II simplified acute physiology score), ARDS severity (PaO₂/FiO₂; reference > 200), mechanical power normalized to predicted body weight (MP_PBW), mechanical power normalized to well inflated tissue (MP_well inflated tissue), mechanical power normalized to respiratory system compliance (MP_CRS), mechanical power normalized to lung gas volume (MP_lung gas volume)