Biology of Sex Differences

Table 5 EFW reference values for boys and girls from 12 to 40 weeks

From: Sex differences in fetal growth and immediate birth outcomes in a low-risk Caucasian population

GA	Boys (EFW)					Girls (EFW)
GA	C5	C10	C50	C90	C95	C5	C10	C50	C90	C95
12	50	51	57	63	65	49	50	55	61	63
13	60	62	69	78	81	61	62	69	76	79
14	77	80	89	101	105	79	82	90	101	104
15	104	107	120	136	142	103	106	117	131	136
16	131	136	152	172	179	128	132	147	165	171
17	159	165	185	208	216	159	164	183	206	213
18	199	205	230	260	269	198	204	229	257	266
19	248	256	287	324	336	242	250	281	316	328
20	298	308	346	391	406	290	299	337	380	394
21	352	364	410	465	482	342	354	398	450	466
22	414	429	486	552	574	402	416	470	531	551
23	488	506	576	658	685	475	493	557	631	655
24	574	596	681	781	813	561	582	660	750	779
25	671	698	799	917	955	658	684	777	884	919
26	779	810	928	1065	1110	765	795	905	1032	1073
27	901	938	1073	1230	1280	883	918	1046	1193	1241
28	1038	1080	1233	1410	1467	1014	1054	1201	1369	1424
29	1188	1235	1407	1605	1669	1158	1204	1369	1558	1620
30	1348	1400	1593	1814	1886	1314	1366	1550	1761	1831
31	1511	1571	1788	2035	2116	1478	1536	1743	1979	2059
32	1672	1739	1985	2265	2357	1638	1704	1937	2206	2298
33	1825	1902	2182	2504	2610	1788	1863	2128	2437	2544
34	1970	2058	2380	2752	2876	1927	2012	2314	2671	2796
35	2108	2209	2577	3007	3152	2060	2156	2500	2912	3059
36	2244	2358	2775	3267	3434	2193	2301	2689	3163	3336
37	2379	2506	2974	3530	3720	2330	2452	2887	3428	3629
38	2513	2655	3174	3795	4009	2475	2610	3095	3707	3940
39	2647	2802	3373	4060	4299	2626	2774	3310	3999	4265
40	2776	2946	3570	4325	4591	2780	2943	3531	4300	4605

Reference values in grams for estimated fetal weight (EFW) for boys and girls for each gestational week for the median and 5th, 10th, 90th, and 95th centiles
GA gestational age

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ISSN: 2042-6410

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