Table 4.

Subgroup analysis: comparing peak PFH between non-AKI and AKI. AKI, acute kidney injury; CPB, cardiopulmonary bypass; PFH, plasma-free haemoglobin; RACHS-1, Risk-Adjusted classification for Congenital Heart Surgery.

	Non-AKI	AKI	P-value
CPB of <120 (n=95)	50 (32.5–70), n=64	60 (40–80), n=31	0.339
CPB of >120 (n=84)	100 (60–120), n=41	100 (80–160), n=43	0.145
RACHS-1 1, 2 (n=72)	50 (40–110), n=47	70 (45–90), n=25	0.185
RACHS-1 of >3 (n=107)	70 (50–100), n=58	90 (55–150), n=49	0.014
Neonates (n=26)	110 (60–150), n=15	110 (40–140), n=11	0.787
Infants (n=84)	60 (40–120), n=43	90 (60–130), n=41	0.045
1–4 yr of age (n=69)	50 (40–70), n=47	70 (47.5–105), n=22	0.111
Non-neonates (n=153)	60 (40–90), n=90	80 (50–130), n=63	0.001
Cyanosis (n=111)	75 (57.5–120), n=62	80 (55–145), n=49	0.548
Non-cyanosis (n=68)	40 (30–60), n=43	80 (50–110), n=25	0.001