Table 2.

Postoperative urinary interleukin-18 (IL-18) concentration

Urinary IL-18	AKI (n = 20)	No AKI (n = 80)	P value
Unadjusted values
Preoperative, pg/mL	0 (0–25)	0 (0–44)	0.28
On arrival in the intensive care unit, pg/mL	168 (19–736)	104 (36–292)	0.70
At 24 hours postoperatively, pg/mL	195 (54–537)	165 (42–288)	0.47
Values adjusted for urinary creatinine
Preoperative, pg/mg	0 (0–12)	0 (0–32)	0.32
On arrival in the intensive care unit, pg/mg	332 (44–1,789)	233 (86–531)	0.57
At 24 hours postoperatively, pg/mg	190 (75–478)	124 (41–245)	0.25

Values denoting median and 25th to 75th percentiles. P values indicate Mann-Whitney U test. AKI, acute kidney injury.