Table 2

Changes in length of mechanical ventilation.

Full cohort

Cohort excluding respiratory admissions

Cohort of respiratory admissions

Cohort excluding trauma admissions

Cohort of trauma admissions

Secular trend (β1)

0.010^a

0.001

0.025

0.011^b

0.009

Trend post-intervention (β2)

0.004

0.001

0.020

0.013^a

-0.009

Immediate effect (β3)

-0.129^b

0.004

-0.383^a

-0.215^b

0.009

^aP < 0.05; ^bP < 0.001

Amaral et al. Critical Care 2012 16:R78   doi:10.1186/cc11335