Fig. 5

Subgroup analyses for associations between ABE with 30-day (a) and 90-day (c) ICU all-cause mortality. Q1 (ABE < − 1.40), Q2 (− 1.40 ≤ ABE < 1.20), Q3 (1.20 ≤ ABE < 3.20), and Q4 (ABE ≥ 3.20). ABE, alactic base excess; AKI, acute kidney injury; BMI, body mass index; CI, confidence interval; HR, hazard ratio