Fig. 1

Urinary levels of five biomarkers after cardiovascular surgery. The vertical box represents the 25th percentile (bottom line), median (middle line) and 75th percentile (top line) values, whereas the vertical bars represent the intervals between maximum and minimum values. a Creatinine-normalized urinary hemojuvelin (uHJV). b Creatinine-normalized urinary kidney injury molecule-1 (uKIM-1). c Creatinine-normalized urinary neutrophil gelatinase-associated lipocalin (uNGAL). d Creatinine-normalized urinary α-glutathione S-transferase (uα-GST). e Creatinine-normalized urinary π-glutathione S-transferase (uπ-GST). *p < 0.05. AKI, acute kidney injury