Fig. 4.

Alluvial diagram of patient movements between ARDS severity groups: Mild hypoxaemia (PaO₂/FiO₂ > 26.7), Moderate hypoxaemia (PaO₂/FiO₂: 26.6–13.3), and severe hypoxaemia (PaO₂/FiO₂ < 13.3) and patient outcome (discharged—green, deceased—red). Each solid bar represents an ARDS severity group at a given number of days since initiation of IMV. Shaded coloured streams between bars represent transitions of patients between the severity groups from one-time point to the next, which is either their new severity or their outcome. The height of the bars represents the proportion of patients at that time point (i.e., they stack up to 100%) and the height of a stream field represents the size of the components contained in both bars connected by the stream