Table 2 Changes in flow volume in the ductus venosus after birth and age at functional closure.

	Group I (n = 36)	Group II (n = 77)	Group III (n = 54)	p Value
				I v II v III	I v II	II v III	I v III
Day 0	17.8 (3.3)	12.2 (1.1)	7.3 (1.3)	0.0860	0.1645	0.1052	0.0665
Day 1	15.5 (1.7)	9.0 (1.2)	6.7 (1.3)	<0.001***	0.0039**	0.3110	<0.001***
Day 3	29.1 (4.8)	5.3 (0.8)	6.6 (3.0)	<0.001***	<0.001***	0.5159	<0.001***
Day 7	11.0 (3.1)	2.5 (0.6)	0.5 (0.3)	<0.001***	<0.001***	0.0049**	<0.001***
Age (days)	10.2 (1.2)	7.1 (0.8)	4.6 (0.4)	<0.001***	0.0146*	0.0071**	<0.001***
Range	5–17	1–16	1–16

Data for flow volume (ml/kg/min) and age at functional closure are mean (SE).

Differences between groups were evaluated with the Kruskal‐Wallis test: *p<0.05, **p<0.01, ***p<0.001.