Table 5.

The normal reference ranges of fetal left ventricular ICT 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	34	7	23	25	29	34	39	42	45
Auto	1528	34	6	25	27	30	35	39	43	45
28–32 weeks
Manual	1486	35	7	24	26	30	35	39	44	47
Auto	1475	34	6	25	27	30	34	38	42	45
34–38 weeks
Manual	1178	34	8	22	25	29	34	38	44	48
Auto	1057	34	6	24	26	30	34	39	42	45

ICT, isovolumetric contraction time.