Maternal Characteristics
|
Non-smoker, non ETS exposed (n = 8100)
|
Non-smoker, ETS exposed (n = 2259)
|
Active smoker (n = 6397)
|
Excluded due to missing smoking data (n = 1541)
|
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Maternal age at birth Mean (SD)
|
29.6 (5.6)
|
28.7 (5.5)
|
26.2 (6.0)
|
29.2 (5.8)
|
BMI Mean (SD)
|
24.0 (4.4)
|
24.0 (4.8)
|
23.2 (4.4)
|
23.8 (4.4)
|
Parity (previous live births) N (%) *
| | | | |
None
|
3310 (42.2)
|
862 (40.1)
|
2838 (45.2)
|
496 (36.0)
|
1–2
|
3952 (50.4)
|
1083 (50.4)
|
2882 (45.9)
|
750 (54.5)
|
3 or more
|
572 (7.3)
|
203 (9.4)
|
553 (8.8)
|
131 (9.5)
|
Alcohol use in pregnancy N (%)
|
622 (7.7)
|
157 (7.0)
|
684 (10.7)
|
98 (6.6)
|
Ethnicity N (column %) *
| | | | |
White
|
6501 (80.4)
|
1701 (75.4)
|
6058 (94.9)
|
1018 (68.2)
|
Asian
|
872 (10.8)
|
412 (18.3)
|
76 (1.2)
|
364 (24.4)
|
Black
|
438 (5.4)
|
43 (1.9)
|
117 (1.8)
|
64 (4.3)
|
Mixed or other
|
275 (3.4)
|
100 (4.4)
|
134 (2.1)
|
46 (3.1)
|
Education N (column %) *
| | | | |
Degree
|
1942 (24.0)
|
320 (14.2)
|
351 (5.5)
|
247 (16.4)
|
Diploma or A level
|
1714 (21.2)
|
440 (19.5)
|
789 (12.4)
|
278 (18.5)
|
O levels
|
3090 (38.2)
|
938 (41.6)
|
3401 (53.3)
|
633 (42.1)
|
None of the above
|
1342 (16.6)
|
558 (24.7)
|
1840 (28.8)
|
347 (23.1)
|
Income (£) N (column %) *
| | | | |
Less than 10,400
|
1482 (19.9)
|
424 (20.3)
|
2514 (42.2)
|
256 (20.9)
|
10,400 to 20,800
|
2194 (29.5)
|
835 (40.0)
|
2058 (34.5)
|
453 (37.0)
|
20,800 to 31,300
|
1723 (23.2)
|
469 (22.5)
|
822 (13.8)
|
240 (19.6)
|
Above 31,200
|
2035 (27.4)
|
358 (17.2)
|
568 (9.5)
|
277 (22.6)
|
- * where numbers in column do not add up to column total, this is due to missing data