Patient characteristics at ICU admission.

<p>Data are n (%) or median (interquartile range).</p><p>SAPS: simplified acute physiology score; LOD: logistic organ dysfunction; COPD: chronic obstructive pulmonary disease; ICU: intensive care unit, ARDS: acute respiratory distress syndrome.</p>#<p>p<0.05 versus microaspiration,</p>§<p>p<0.05 versus abundant microaspiration.</p><p>*Several patients had more than one cause for ICU admission.