Table 2.

Median kidney filtration onset delay, filtration half-life, and steady state creatinine level with CI by gestational age group

GA groups in weeks	Median (95% CI) filtration onset delay in days	Median (95% CI) filtration half-life in days	Median (95% CI) steady state creatinine in mg/dl
1 (22 < GA ≤ 27)	4.26 (3.71, 4.89)*	8.69 (7.99, 9.46)**	0.28 (0.27, 0.29)
2 (27 < GA ≤ 32)	1.89 (1.76, 2.02)	6.26 (5.69, 6.89)**	0.29 (0.27, 0.31)
3 (32 < GA ≤ 37)	1.71 (1.57, 1.86)	4.38 (3.91, 4.91)**	0.26 (0.25, 0.27)
4 (37 < GA ≤ 42)	1.64 (1.53, 1.75)	4.05 (3.74, 4.40)†	0.27 (0.26, 0.28)

^*Group 1 statistically different than Groups 2,3, and 4 (p<0.001)

^**Groups 1, 2, and 3 are significantly different from each other (p<0.001)

^†Group 4 is not significantly different from Group 3, but is from Groups 1 and 2 (p<0.001)