Table 4:

Median, 5th, and 95th percentiles for SA measurements

Gestational Age (wk)	Imaging Modality
	US 2D			US 3D			MRI
	%5	Median	%95	%5	Median	%95	%5	Median	%95
21	82.41	99.27	112.76	70.00	98.00	126.00
22	92.43	114.88	131.10	95.00	125.00	141.00
23	100.38	125.18	146.12	92.00	119.00	164.00
24	130.89	138.14	154.26	118.00	140.50	175.00
25	135.91	170.76	198.12	127.00	155.00	233.00
26	139.84	189.49	234.09	150.00	193.00	215.00
27	158.35	198.22	234.51	176.00	223.00	255.00	127.08	143.50	152.34
28	182.56	222.26	293.91	177.00	218.00	376.00	132.66	157.32	176.64
29	215.82	246.64	293.68	199.00	235.00	319.00	140.89	175.90	204.92
30	228.12	255.40	282.77	223.00	286.00	330.00	170.35	196.48	251.86
31	240.25	268.21	299.06	219.00	298.00	355.00	181.44	214.24	239.03
32	241.17	282.90	330.94	263.00	297.00	412.00	202.60	229.60	272.65
33	274.90	325.12	370.45	295.00	308.00	383.00	207.49	246.18	266.11
34	283.93	340.38	405.17	256.00	327.00	540.00	224.95	246.21	322.73
35	302.87	350.00	392.47	280.00	323.00	478.00	242.75	279.97	363.32

Note:—%5 indicates 5th percentile; %95, 95th percentile.