Table 6.

Percentiles of fetal superior vena cava volume blood flow normalized by brain weight (ml/min/100 g) at 28–40 weeks of gestational age (GA).

		Percentile
GA (weeks)	n	2.5th	5th	10th	50th	90th	95th	97.5th
20
21
22
23
24
25
26
27
28	27	22.50	25.21	28.74	45.64	72.49	82.63	92.58
29	21	22.78	25.58	29.23	46.82	74.99	85.69	96.21
30	34	23.01	25.89	29.65	47.91	77.41	88.67	99.77
31	25	23.19	26.15	30.02	48.92	79.73	91.55	103.22
32	17	23.32	26.35	30.33	49.85	81.93	94.31	106.56
33	24	23.39	26.49	30.57	50.67	84.01	96.94	109.76
34	25	23.42	26.57	30.74	51.40	85.94	99.41	112.80
35	24	23.39	26.60	30.84	52.02	87.73	101.72	115.67
36	17	23.31	26.56	30.88	52.53	89.35	103.86	118.34
37	18	23.18	26.47	30.84	52.92	90.80	105.80	120.81
38	22	23.00	26.32	30.74	53.20	92.07	107.54	123.05
39	17	22.77	26.11	30.57	53.36	93.14	109.06	125.06
40	2	22.49	25.84	30.33	53.40	94.02	110.35	126.81

No data presented for 20–27 weeks as the formula used for brain weight estimation is not valid before 28 weeks of gestation.