Table 4.

Multivariable linear regression model of the association between sedation cohort and the duration of mechanical ventilation

Hospital/Patient Characteristic	Ratio of Medians exp β (95% CI)	P Value
Cohort, sedation-reducing protocol	0.82 (0.68–0.99)	0.04
Admission SAPS II	1.04 (1.04–1.05)	<0.01
Male sex	0.83 (0.67–1.03)	0.09
Age, yr	0.99 (0.99–0.997)	<0.01
Weight, kg	1.01 (1.002–1.01)	<0.01

Definition of abbreviations: CI = confidence interval; SAPS = Simplified Acute Physiology Score.

Duration of mechanical ventilation log-transformed to make the distribution of the variable more symmetric. The β coefficients have been exponentiated and represent the ratio of median duration of mechanical ventilation. Errors were computed using robust variance estimation.