Table 6.

The normal reference ranges of fetal left ventricular ET based on the cross-sectional data with the manual and automatic measurements

Weeks of gestation	No	Mean	SD	Percentile
				5	10	25	50	75	90	95
20–24 weeks
Manual	1710	170	9	155	158	163	169	175	182	186
Auto	1528	170	9	155	159	164	170	175	181	185
28–32 weeks
Manual	1486	169	11	153	157	163	169	176	183	188
Auto	1475	170	11	152	157	163	169	176	184	189
34–38 weeks
Manual	1178	168	12	149	153	161	169	177	183	188
Auto	1057	169	12	148	154	160	169	178	186	189

ET, ejection time.