Study flow chart illustrating different patient groups and their crude 90-day mortality with 95% confidence intervals. 90-d M, 90-day mortality; FINNAKI, Finnish Acute Kidney Injury; ICU, intensive care unit; MARS, molecular adsorbent recirculation system; pts, patients. *One hundred ninety-one (7.3%) patients had treatment restrictions or were deceased within the first 5 days in the ICU.