Table 2.

Gestational age at booking stratified by maternal ethnicity

Self-defined ethnicity	Gestational age at booking (weeks)				Total
	Median	Up to 12	13 to 19	20 or more
	(LQ, UQ)	(+6 days)	(+6 days)
British (White)	10	2,768	735	372	3,875
	(9, 13)	71.4%	19.0%	9.6%
African	12	1,499	802	414	2,715
(except Somali)	(10, 16)	55.2%	29.5%	15.2%
Somali	13	214	169	97	480
	(10, 18)	44.6%	35.2%	20.2%
Caribbean	11	375	157	59	591
	(9, 14)	63.5%	26.6%	10.0%
Eastern European	12	1,438	699	394	2,531
	(9, 16)	56.8%	27.6%	15.6%
Other White	11	257	94	44	395
	(9, 14)	65.1%	23.8%	11.1%
Bangladeshi	11	1,769	794	304	2,867
(incl. British)	(9, 15)	61.7%	27.7%	10.6%
Indian	11	1,200	460	182	1,842
(incl. British)	(9, 14)	65.1%	25.0%	9.9%
Pakistani	11	2,018	743	348	3,109
(incl. British)	(9, 14)	64.9%	23.9%	11.2%
Other Asian	12	586	251	120	957
	(10, 15)	61.2%	26.2%	12.5%
Other	12	414	185	86	685
	(10, 15)	60.4%	27.0%	12.6%
Overall	11	12,538	5,089	2,420	20,047
	(9,15)	62.5%	25.4%	12.1%

LQ, Lower (25^th) quartile; UQ, upper (75^th) quartile.