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Table 2: Median, 5th, and 95th percentiles for AP measurements
Gestational Age (wk) Imaging Modality
US 2D US 3D MRI
%5 Median %95 %5 Median %95 %5 Median %95
21 7.08 7.79 8.71 5.70 8.10 10.30 
22 7.51 9.51 10.62 7.40 9.15 12.40 
23 7.27 8.72 10.25 6.30 8.80 11.00 
24 8.96 9.49 10.64 8.60 9.85 11.00 
25 9.58 10.73 13.17 9.90 10.50 14.60 
26 8.76 11.28 14.17 8.10 11.30 12.80 
27 10.06 11.44 12.69 9.30 12.50 14.80 9.11 9.33 11.10
28 10.75 12.32 14.94 9.20 12.30 15.90 8.90 9.97 12.04
29 10.09 12.61 15.01 11.20 12.80 14.40 8.93 11.05 13.28
30 11.06 13.36 14.94 10.70 13.70 16.80 10.39 11.92 15.01
31 12.69 14.01 15.81 11.80 14.60 18.00 11.07 12.30 13.96
32 11.93 13.87 17.38 10.70 15.20 18.40 11.40 13.04 13.90
33 12.63 15.11 17.83 11.80 13.05 19.70 11.91 13.26 15.22
34 12.36 15.94 17.82 12.00 15.60 21.40 11.18 13.77 15.10
35 13.84 16.40 17.40 12.60 15.75 18.90 12.70 14.83 17.17
Note:—%5 indicates 5th percentile; %95, 95th percentile.

Gestational Age (wk)	Imaging Modality
	US 2D			US 3D			MRI
	%5	Median	%95	%5	Median	%95	%5	Median	%95
21	7.08	7.79	8.71	5.70	8.10	10.30
22	7.51	9.51	10.62	7.40	9.15	12.40
23	7.27	8.72	10.25	6.30	8.80	11.00
24	8.96	9.49	10.64	8.60	9.85	11.00
25	9.58	10.73	13.17	9.90	10.50	14.60
26	8.76	11.28	14.17	8.10	11.30	12.80
27	10.06	11.44	12.69	9.30	12.50	14.80	9.11	9.33	11.10
28	10.75	12.32	14.94	9.20	12.30	15.90	8.90	9.97	12.04
29	10.09	12.61	15.01	11.20	12.80	14.40	8.93	11.05	13.28
30	11.06	13.36	14.94	10.70	13.70	16.80	10.39	11.92	15.01
31	12.69	14.01	15.81	11.80	14.60	18.00	11.07	12.30	13.96
32	11.93	13.87	17.38	10.70	15.20	18.40	11.40	13.04	13.90
33	12.63	15.11	17.83	11.80	13.05	19.70	11.91	13.26	15.22
34	12.36	15.94	17.82	12.00	15.60	21.40	11.18	13.77	15.10
35	13.84	16.40	17.40	12.60	15.75	18.90	12.70	14.83	17.17