Variables
|
Total N (%)
|
Pre-Pregnancy Body Mass Index
|
P-value (Χ2)
|
---|
Underweight N (%)
|
Normal weight N (%)
|
Overweight N (%)
|
Obese Class I N (%)
|
Obese Class II & III N (%)
|
---|
Total
|
7564 (100.0%)
|
473(5.5%)
|
4897(66.0%)
|
1502(19.5%)
|
488(6.4%)
|
204(2.6%)
| |
Education
|
None of these
|
1465 (15.4%)
|
163 (31.9%)
|
873 (13.9%)
|
305 (15.8%)
|
85 (13.9%)
|
39 (17.9%)
|
< 0.0001
|
GCSE/A level
|
4260 (57.5%)
|
244 (54.1%)
|
2714 (56.2%)
|
866 (59.5%)
|
306 (64.9%)
|
130 (64.1%)
|
Higher education
|
1839 (27.1%)
|
66 (14.0%)
|
1310 (29.9%)
|
331 (24.7%)
|
97 (21.2%)
|
35 (18.0%)
|
Marital status
|
Couple
|
4545 (60.9%)
|
205 (38.7%)
|
2934 (61.2%)
|
946 (63.2%)
|
330 (68.1%)
|
130 (65.9%)
|
< 0.0001
|
Single
|
3019 (39.1%)
|
268 (61.3%)
|
1963 (38.8%)
|
556 (36.8%)
|
158 (31.9%)
|
74 (34.1%)
|
OECD equivalised income quintile
|
1st (lowest)
|
1570 (16.5%)
|
185 (34.92%)
|
979 (15.6%)
|
294 (19.6%)
|
73 (15.0%)
|
41 (16.4%)
|
< 0.0001
|
2nd
|
1605 (18.4%)
|
138 (27.28%)
|
918 (16.4%)
|
347 (23.1%)
|
141 (28.9%)
|
62 (28.1%)
|
3rd
|
1473 (20.4%)
|
70 (18.25%)
|
944 (19.8%)
|
309 (20.6%)
|
107 (22.0%)
|
43 (22.1%)
|
4th
|
1440 (21.2%)
|
37 (7.69%)
|
964 (19.7%)
|
300 (20.0%)
|
100 (20.5%)
|
39 (22.4%)
|
5th (highest)
|
1476 (23.5%)
|
43 (11.33%)
|
1092 (26.5%)
|
252 (16.8%)
|
67 (13.7%)
|
22 (11.0%)
|
Ethnicity
|
White
|
6259 (90.1%)
|
340 (83.2%)
|
4137 (91.2%)
|
1208 (88.7%)
|
397 (88.4%)
|
177 (92.7%)
|
< 0.0001
|
Mixed/Other
|
249 (2.5%)
|
28 (3.7%)
|
157 (2.4%)
|
45 (2.1%)
|
15 (3.0%)
|
4 (1.4%)
|
Indian/ Pakistani/Bangladeshi
|
794 (5.2%)
|
88 (9.7%)
|
471 (4.8%)
|
176 (6.2%)
|
45 (4.4%)
|
14 (2.9%)
|
Black Caribbean or Black African
|
262 (2.2%)
|
17 (3.4%)
|
132 (1.6%)
|
73 (3.0%)
|
31 (4.2%)
|
9 (3.0%)
|
Government Office Region*
|
North
|
2345 (29.7%)
|
158 (32.5%)
|
1523 (29.8%)
|
460 (29.4%)
|
139 (27.9%)
|
65 (28.9%)
|
0.40
|
Midlands & East
|
2391 (30.9%)
|
138 (27.2%)
|
1505 (30.3%)
|
504 (32.0%)
|
171 (33.9%)
|
73 (30.9%)
|
London
|
1213 (13.8%)
|
90 (16.2%)
|
793 (13.9%)
|
231 (13.7%)
|
77 (13.4%)
|
22 (13.8%)
|
South
|
1615 (25.6%)
|
87 (24.1%)
|
1076 (26.0%)
|
307 (24.9%)
|
101 (24.8%)
|
44 (26.5%)
|
Premature
|
No
|
7055 (93.4%)
|
428 (90.4%)
|
4575 (93.7%)
|
1419 (94.2%)
|
457 (93.4%)
|
176 (85.7%)
|
0.0002
|
Yes
|
509 (6.6%)
|
45 (9.6%)
|
322 (6.3%)
|
83 (5.8%)
|
31 (6.6%)
|
28 (14.3%)
|
Parity
|
Primiparae
|
7291 (96.5%)
|
444 (93.6%)
|
4747 (97.0%)
|
1445 (96.0%)
|
466 (95.5%)
|
189 (93.2%)
|
0.001
|
Multiparae
|
273 (3.5%)
|
29 (6.4%)
|
150 (3.0%)
|
57 (4.0%)
|
22 (4.5%)
|
15 (6.8%)
|
Notional cost of treatment (UK£)
|
1–250
|
11 (0.2%)
|
1 (0.2%)
|
5 (0.2%)
|
3 (0.2%)
|
2 (0.6%)
|
0 (0.00%)
|
< 0.0001
|
250–500
|
1126 (14.9%)
|
86 (17.7%)
|
747 (15.7%)
|
218 (14.1%)
|
58 (10.9%)
|
17 (9.2%)
|
500–750
|
3615 (47.7%)
|
238 (51.8%)
|
2.394 (48.5%)
|
695 (47.3%)
|
198 (39.9%)
|
90 (42.5%)
|
750–1000
|
1701 (22.7%)
|
93 (18.7%)
|
1108 (22.8%)
|
331 (22.4%)
|
126 (27.0%)
|
43 (20.2%)
|
1000–1250
|
656 (8.8%)
|
28 (5.9%)
|
385 (8.0%)
|
151 (9.8%)
|
59 (12.4%)
|
33 (18.6%)
|
1250–1500
|
221 (2.8%)
|
12 (2.2%)
|
126 (2.5%)
|
54 (3.3%)
|
26 (5.5%)
|
3 (1.1%)
|
1500–1750
|
85 (1.1%)
|
5 (1.1%)
|
46 (0.9%)
|
21 (1.3%)
|
6 (1.2%)
|
7 (3.1%)
|
1750–2000
|
43 (0.6%)
|
2 (0.5%)
|
21 (0.4%)
|
12 (0.8%)
|
3 (0.5%)
|
5 (3.0%)
|
2000 or over
|
106 (1.2%)
|
8 (1.8%)
|
65 (1.2%)
|
17 (0.9%)
|
10 (2.0%)
|
6 (2.4%)
|
|
Mean (SE)
|
Mean (SE)
|
Mean (SE)
|
Mean (SE)
|
Mean (SE)
|
Mean (SE)
|
Mean (SD)
|
Maternal age (years)
|
28.8 (0.2)
|
25.0 (0.3)
|
28.8 (0.2)
|
29.4 (0.2)
|
29.3 (0.3)
|
29.8 (0.4)
|
< 0.0001
|
Length of stay (days)
|
2.8 (0.1)
|
2.6 (0.2)
|
2.7 (0.1)
|
2.9 (0.1)
|
3.4 (0.2)
|
3.8 (0.3)
|
< 0.0001
|
- Abbreviations: N Number of women, SE Standard error
- *North includes: North East, North West, Yorkshire & the Humber, Northern Ireland, and Wales; South Includes: South East and South West; Midland and East include: East Midlands, West Midlands, and East of England