Table 2. Risks of acute kidney injury according to the acute kidney injury network criteria.

AKIN stage	Sodium bicarbonate		Saline		Relative risk (95% CI)
I: Increase > 26.5 umol/L or > 150% - 200% from baseline	16/163	(9.8%)	15/160	(9.4%)	1.0 (0.5–2.0)
II: Increase 200–300% from baseline	0/163	(0.0%)	0/160	(0.0%)	NA
III: Increase > 300%, or > 354 umol/L, or on RRT	0/163	(0.0%)	0/160	(0.0%)	NA

Abbreviations: RRT = renal replacement therapy, NA = not applicable