Fig. 2

PaCO2, minute ventilation, and standardized minute ventilation, during the first ICU week, stratified in no AKI, transient AKI, and persistent AKI groups. The trend in PaCO2, minute ventilation, and standardized minute ventilation over time in patients without AKI (green circles), with transient (blue triangles), and persistent (red squares) AKI. All data represent mean ± SEM. $ refers to the effect of AKI groups on the continuous variable; $$ refers to the effect of day from ICU admission on the continuous variable; $$$ refers to the interaction between AKI groups and day from ICU admission on the continuous variable. ✚P < 0.05 for comparison between no-AKI and transient AKI groups; *P < 0.05 for comparison between no-AKI and persistent AKI groups; #P < 0.05 for comparison between transient and persistent AKI groups. Definition of abbreviation. PaCO2, arterial partial pressure of carbon dioxide