Table 2

Distribution of births and mean birth weights by key variables for all live singleton births and those born within marriage, England and Wales 2005–2006

		All live singleton births		All live singleton births in marriage
		N	Mean birth weight	N	Mean birth weight
Ethnicity	White British	769 669	3391	378 696	3457
	Bangladeshi	16 076	3072	15 507	3074
	Indian	26 870	3087	25 793	3089
	Pakistani	45 914	3129	44 314	3130

Country of birth of mother	England and Wales	801 416	3379	408 209	3430
	Bangladesh	13 102	3082	12 844	3084
	India	15 594	3104	15 359	3105
	Pakistan	28 417	3148	27 898	3148

Maternal age (y)	<20	65 886	3254	4044	3132
	20–24	173 057	3295	49 857	3246
	25–29	219 259	3354	128 012	3362
	30–34	240 527	3410	172 823	3432
	35–39	132 965	3419	92 569	3446
	40+	26 835	3397	17 005	3423

Previous live & stillborn^*	0	–	–	186 414	3318
	1	–	–	171 569	3460
	2	–	–	68 941	3439
	3+	–	–	37 386	3372

Gestational age (weeks)	<35	22 057	1787	10 370	1809
	35–36	30 271	2659	15 019	2691
	37–38	156 586	3133	88 067	3170
	39–41	606 190	3494	329 276	3517
	42+	37 065	3677	18 923	3693
	Inconsistent^†	96	3074	45	3245
	Not stated/known	6264	3319	2610	3359

NS-SEC^‡	Managerial & professional	29 278	3434	21 713	3439
	Intermediate	16 145	3367	9297	3384
	Routine & manual	31 381	3327	14 153	3337
	Other	3550	3223	1297	3232

Marital status/type of registration	In marriage	464 310	3393	–	–
	Sole registration	55 437	3241	–	–
	Joint registration same address	261 075	3359	–	–
	Joint registration different address	77 707	3270	–	–

Year of birth	2005	422 482	3361	230 328	3393
	2006	436 047	3362	233 982	3392

Total		858 529	3362	464 310	3393

Note: this table includes only live singleton births of known birth weight, and White British, Indian, Pakistani or Bangladeshi ethnicity where either the mother was born in England and Wales, or in India if Indian, in Pakistan if Pakistani or in Bangladesh if Bangladeshi.
↵* Only available for those born in marriage.
↵† Low gestational age inconsistent with birth weight (see reference 27 for further details).
↵‡ Restricted to 10% sample coded to National Statistics Socio-Economic Classification (NS-SEC).