Reference birthweight range for multiple birth neonates in Japan

Table 1 Number of subjects analyzed from each gestational week

gestational age (weeks)	Twins		triplets		quadruplets
	male	female	male	female	male	female
24	76	64	14	14	3	1
25	121	111	11	7	5	6
26	105	116	7	11
27	176	145	14	25	3	7
28	208	196	26	35	13	11
29	211	204	38	40	17	11
30	309	287	33	27	15	12
31	427	325	51	52	13	15
32	673	549	59	54	10	8
33	906	844	109	108	10	7
34	1366	1356	115	123	12	11
35	2306	2122	141	131	3	5
36	4257	4132	143	154	2	2
37	7276	7128	89	96
38	6963	7343	41	66
39	4358	4632	16	21
40	1924	2135		1
41	456	470
42	39	39

ISSN: 1471-2393