Birth weight for gestational age norms for a large cohort of infants born to HIV-negative women in Botswana compared with norms for U.S.-born black infants

Table 2 Estimated birth weight percentile by gestational age for babies born to HIV-negative women in Botswana

		Estimated birth weight percentile (grams) by gestational age
Gestation age (weeks)	N	3^rd	5^th	10^th	25^th	50^th	75^th	90^th	95^th	10^th U.S.*
30	62	946	1042	1170	1380	1693	2255	2699	2840	980
31	71	1067	1179	1318	1553	1915	2475	2895	3038	1188
32	119	1214	1336	1485	1740	2130	2664	3054	3200	1419
33	162	1384	1509	1670	1936	2333	2822	3179	3330	1616
34	268	1574	1697	1866	2135	2520	2950	3277	3433	1849
35	394	1777	1891	2067	2332	2688	3055	3356	3517	2070
36	687	1979	2082	2260	2517	2834	3146	3427	3590	2248
37	1056	2165	2258	2433	2680	2960	3230	3500	3663	2439
38	1758	2313	2405	2570	2810	3065	3320	3588	3747	2632
39	2340	2409	2510	2660	2900	3152	3420	3697	3848	2750
40	2482	2471	2580	2714	2957	3220	3511	3800	3945	2814
41	1357	2525	2626	2750	2992	3270	3570	3867	4015	2836
42	746	2577	2654	2773	3012	3305	3600	3900	4060	2779
43	125	2629	2670	2788	3021	3330	3610	3910	4088	2770

* 10^th percentile for U.S.-born black infants. Oken E, Kleinman KP, Rich-Edwards J, Gillman MW. A nearly continuous measure of birth weight for gestational age using a United States national reference. BMC Pediatrics 2003;3:10

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