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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Crit Care Med. 2012 Oct;40(10):2883–2889. doi: 10.1097/CCM.0b013e31825bc54d

Table 2.

Factors associated with ventilator-free days in the univariate analyses.

Clinical Covariates Regression Coefficient p value
Cumulative Day 3 Fluid Balance (ml/kg) −0.02 0.02
PRISM III −0.24 0.01
Age (yrs) −0.23 0.04
Gender, Male 0.06 0.97
Race, White −1.23 0.38
PaO2/FiO2 at Study Entry 0.01 0.02
Vasopressor Use at Study Entry −4.10 0.01
Chronic Disease at Study Entry 0.01 0.99
Direct Lung Injury at Study Entry 2.27 0.22

PRISM, Pediatric Risk of Mortality

Linear regression model was used to assess the association between clinical covariates and ventilator-free days. Clinical covariates were retained in the model if the univariate p value was < 0.2. Age, gender and race were kept in the multivariate model due to clinical relevance.