Table 3. Severity of AKI in the exposed and the non-exposed groups.

Acute kidney injury a	Exposed group	Non-exposed group
	n = 193	n = 193
Overall AKI by serum creatinine criteria, n (%)	61 (31.6)	26 (13.5)
Stage 1	47 (24.4)	17 (8.8)
Stage 2	12 (6.2)	5 (2.6)
Stage 3	2 (1.0)	4 (2.1)
Overall AKI by urine output criteria, n (%)	14 (8.0)	7 (4.1)
Stage 1	7 (3.6)	4 (2.1)
Stage 2	1 (0.5)	0 (0.0)
Stage 3	6 (3.1)	3 (1.6)

Abbreviation: AKI = acute kidney injury

^a Severity of AKI was graded according to neonatal AKI definitions. 22