. Author manuscript; available in PMC: 2018 Aug 1.

Published in final edited form as: J Am Soc Echocardiogr. 2017 Jun 7;30(8):781–789.e4. doi: 10.1016/j.echo.2017.04.010

Table 1.

Baseline patient characteristics.

	Retrospective (n = 372)	Prospective (n = 131)	P value
Males	186 (50%)	63 (48%)	0.7
Weight (kilograms)	1.2 ± 0.47	1.3 ± 0.35	0.01
Gestational age	27.05 ± 3.24	26.27 ± 1.46	0.6
PMA, weeks	30.09 ± 4.29	30.89 ± 2.59	0.004
Chronological age	21.29 ± 22.56	32.4 ± 19.1	<0.0001
Length, cm	36.58 ± 4.95	37.04 ± 2.94	0.2
BSA, Kg/m²	0.11 ± 0.03	0.12 ± 0.02	0.01
PDA	177 (47.6%)	52 (40%)	0.3
Atrial shunt	332 (89%)	121 (92%)	0.7

Note: Values expressed as mean ± SD or number (percentage). Postmenstrual age (PMA, weeks); Weight, in kilograms on the day of scan; Body surface area (BSA, Kg/m²); Patent ductus arteriosus (PDA).