Table I.

Sample Sizes and LMS Parameters for Birth Weight in Down Syndrome by Sex and Gestational Age (n = 8,825)

Gestational age	Number of births		M
(weeks)	Boys	Girls	Boys	Girls	L	S
28	11	10	960	937	−0.12	0.266
29	16	19	1132	1105	−0.03	0.253
30	26	23	1319	1288	0.06	0.243
31	29	27	1518	1482	0.15	0.237
32	73	41	1719	1678	0.23	0.233
33	84	54	1915	1869	0.31	0.228
34	117	85	2113	2063	0.39	0.220
35	192	156	2333	2277	0.47	0.206
36	414	298	2567	2506	0.55	0.189
37	693	525	2800	2733	0.62	0.174
38	1219	921	3019	2947	0.69	0.162
39	822	824	3164	3088	0.76	0.153
40	797	809	3251	3174	0.83	0.150
41	204	207	3304	3225	0.89	0.151
42	55	56	3318	3239	0.96	0.152
43	8	10	3300	3221	1.02	0.153

M, Median: L, skewness; S, coefficient of variation.