BMC Pregnancy and Childbirth

Table 3 Longitudinal reference percentiles of resistance index (RI) for IAA

From: Zone-specific reference ranges of fetal adrenal artery Doppler indices: a longitudinal study

GA (weeks)	Percentile
GA (weeks)	2.5th	5th	10th	50th	90th	95th	97.5th
20	0.57	0.58	0.59	0.64	0.69	0.7	0.72
21	0.57	0.58	0.6	0.65	0.7	0.71	0.72
22	0.57	0.59	0.6	0.65	0.7	0.71	0.73
23	0.58	0.59	0.6	0.65	0.7	0.72	0.73
24	0.58	0.59	0.6	0.66	0.71	0.72	0.73
25	0.58	0.59	0.61	0.66	0.7	0.72	0.73
26	0.58	0.59	0.61	0.66	0.71	0.72	0.73
27	0.58	0.59	0.61	0.66	0.71	0.72	0.73
28	0.58	0.59	0.6	0.65	0.7	0.72	0.73
29	0.57	0.59	0.6	0.65	0.7	0.71	0.73
30	0.57	0.58	0.6	0.65	0.7	0.71	0.72
31	0.57	0.58	0.59	0.64	0.69	0.7	0.72
32	0.56	0.57	0.58	0.64	0.68	0.7	0.71
33	0.55	0.56	0.58	0.63	0.68	0.69	0.7
34	0.54	0.55	0.57	0.62	0.67	0.68	0.69
35	0.53	0.55	0.56	0.61	0.66	0.67	0.68
36	0.52	0.54	0.55	0.6	0.65	0.66	0.68
37	0.51	0.52	0.54	0.59	0.64	0.65	0.66
38	0.5	0.51	0.52	0.57	0.62	0.64	0.65
39	0.48	0.5	0.51	0.56	0.61	0.63	0.64
40	0.47	0.48	0.5	0.55	0.6	0.61	0.62
41	0.46	0.47	0.48	0.53	0.59	0.6	0.61

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ISSN: 1471-2393

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