. Author manuscript; available in PMC: 2021 Jan 1.

Published in final edited form as: Am J Perinatol. 2019 Nov 18;37(2):231–240. doi: 10.1055/s-0039-1698836

Table 4.

Comparison of unadjusted weeks of mechanical ventilator support in first 4 weeks among infants with and without acute kidney injury

	No AKI (n = 986)	AKI (n = 362)	p-Value^a
Any oxygen support (%)
0 wk	89.4	72.4	<0.0001
1 wk	3.5	7.5
2 wk	5.6	9.4
3 wk	0.6	4.1
4 wk	0.9	6.6
Invasive mechanical ventilation weeks (%)
0 wk	94.5	78.5	<0.0001
1 wk	1.5	5.0
2 wk	2.9	8.6
3 wk	0.5	4.1
4 wk	0.5	3.9
CPAP/noninvasive ventilation (%)
0 wk	93.9	89.8	0.0249
1 wk	3.3	6.4
2 wk	2.5	3.3
3 wk	0.0	0.0
4 wk	0.2	0.6
High FiO₂ weeks^b (%)
0 wk	88.4	75.7	<0.0001
1 wk	4.6	9.7
2 wk	5.2	8.8
3 wk	0.9	3.9
4 wk	0.9	1.9
Low FiO₂ weeks^c (%)
0 wk	81.6	71.0	<0.0001
1 wk	8.2	12.2
2 wk	8.4	12.2
3 wk	1.3	3.3
4 wk	0.4	1.4

Abbreviation: FiO₂, fraction of inspired oxygen.

Estimated from a Cochran–Mantel–Haenszel test statistic.

Fraction of inspired oxygen (FiO₂) ≥0.30.

Fraction of inspired oxygen (FiO₂) <0.30.