Fig. 1 (abstract P401).

PCA of the correlated cluster of variables days on RRT, days in hospital, cumulative midazolam dose, days on ICU, days on gastric tube, days on invasive mechanical ventilation, cumulative midazolam dose and APACHE II score. PCs 1 to 4 (A-C) are shown on horizontal and vertical axes. Based on PC 1 to 3 (explaining 70.25% of the variance), three groups of swappable variables were identified: (1) days on RRT, days in hospital and cumulative midazolam dose, (2) days in ICU, days on gastric tube, days on invasive mechanical ventilation and cumulative propofol dose and (3) APACHE II score. The first member of each group was selected as representative variable