Table 1

Characteristics of the study population

Gestation at birth	24–27 weeks		28–31 weeks		32–36 weeks		Total
Number of births	N	%	N	%	N	%	N
Ethnicity								% IMD5
White British	6727	57.7	16 852	63.2	141 887	65.1	165 466	28.4
White Non-British	653	5.6	1436	5.4	13 534	6.2	15 623	27.5
Pakistani	540	4.6	1200	4.5	8930	4.1	10 670	56.0
Indian	339	2.9	822	3.1	6749	3.1	7910	25.9
Bangladeshi	141	1.2	340	1.3	3442	1.6	3923	58.2
Black African	857	7.4	1348	5.1	7100	3.3	9305	49.7
Black Caribbean	336	2.9	536	2.0	2934	1.4	3806	51.5
Other stated	1231	10.6	2462	9.2	19 707	9.1	23 400	36.5
Unstated	828	7.1	1691	6.3	13 520	6.2	16 039	26.9
IMD								% WB
1=advantaged	1229	10.5	3073	11.5	28 256	13.0	32 558	76.1
2	1560	13.4	3697	13.9	32 612	15.0	37 869	73.4
3	1921	16.5	4482	16.8	38 534	17.7	44 937	67.9
4	2784	23.9	6504	24.4	50 400	23.1	59 688	59.2
5=disadvantaged	4158	35.7	8931	33.5	68 001	31.2	81 090	58.0
Total	11 652	100.0	26 687	100.0	217 803	100.0	256 142	100.0

Live singleton births at 24 – 36 weeks , England and Wales 2006 – 2012. Stratified by gestational age at birth (completed weeks).
IMD, Index of Multiple Deprivation; IMD5, most disadvantaged IMD quintile; N, number of births; WB, White British.