Table 3. US features of NEC.

Features		Normal	NEC	p-value
Intramural gas	No	102	47	<0.0001
	Yes	0	64
Portal venous gas	No	89	32	<0.0001
	Yes	13	79
Intestinal wall thickness (mm)		0.75±0.14	0.89±0.31	<0.0001
Bowel dilatation	No	71	26	<0.0001
	Yes	31	85
Reduced inflation	No	76	97	0.016
	Yes	26	14
Decreased intestinal peristalsis	No	56	39	0.003
	Yes	46	72
Undetectable intestinal peristalsis	No	102	98	<0.0001
	Yes	0	13
Seroperitoneum (no/yes)	No	93	100	0.786
	Yes	9	11