Table 2.

Lung ultrasound characteristics associated to NICU admission. Variables are reported as raw number (percentages) for the three-image ultrasound score (LUS) and as mean (standard deviation) for the full LUS. A P value < 0.05 is considered as statistically significant

	Overall population (n = 100)	Infants admitted to the NICU (n = 7)	Infants not admitted to the NICU (n = 93)	P value
Three-image LUS				0.005
Both type 1 lungs	5 (5%)	5 (71.4%)	0
One type 1 lung, one type 2 lung	6 (6%)	1 (14.3%)	5 (5.4%)
Both type 2 lungs	62 (62%)	1 (14.3%)	61 (65.6%)
One type 2 lung, one type 3 lung	10 (10%)	0	10 (10.8%)
Both type 3 lungs	17 (17%)	0	17 (18.3%)
Full LUS	9 (5)	17 (2)	8 (4)	< 0.001