Table 4

Comparison of the areas under the receiver operator characteristic curves (P value for the two-tailed test)

Index

PaO₂/FiO₂

Cst,rs

IWI

P 0.1

f

Vt

f/Vt × P 0.1

Cst,rs

0.01

IWI

<0.0001

0.002

P 0.1

0.38

0.09

0.00001

f

0.29

0.12

<0.00001

0.88

Vt

0.024

0.75

0.0006

0.15

0.2

f/Vt × P 0.1

0.037

0.63

0.0006

0.021

0.11

0.84

f/Vt

0.003

0.77

0.003

0.005

0.004

0.30

0.20

f = respiratory rate; f/Vt ratio = frequency to tidal volume ratio; IWI = integrative weaning index; P 0.1 = airway occlusion pressure; PaO₂/FiO₂ ratio = ratio of arterial oxygen tension to fraction of inspired oxygen; Vt = tidal volume.

Nemer et al. Critical Care 2009 13:R152   doi:10.1186/cc8051