Table 3.
Population characteristics of the pregnant women included, between 1995 and 2007 in England
| Total | Underweighta | Idealb | Overweightc | Obesed | |
|---|---|---|---|---|---|
|
BMI, mean (SD) |
24.7 (5.2) |
17.3 (1.0) |
21.9 (1.7) |
26.8 (1.6) |
34.1 (4.5) |
|
BMI, median (interquartile range)e |
23.7 (5.9) |
17.6 (1.3) |
22.0 (2.8) |
26.9 (2.4) |
33.3 (5.1) |
|
Gestational Age at Booking in Weeks, mean (SD) |
13.9 (6.5) |
19.4 (10.5) |
13.8 (6.2) |
13.5 (5.9) |
13.1 (5.6) |
|
Booked after 1stTrimester, n (%) |
204,355 (40.7) |
5,869 (37.1) |
108,930 (39.5) |
56,965 (42.7) |
32,591 (42.3) |
|
Parity Group, n (%) |
|||||
| 0 |
175,826 (37.8) |
10,241 (43.2) |
102,727 (40.5) |
42,265 (35.3) |
20,593 (30.7) |
| 1 |
174,980 (37.7) |
8,396 (35.4) |
95,497 (37.6) |
45,710 (38.1) |
25,377 (37.8) |
| 2 |
81,622 (17.6) |
3,700 (15.6) |
40,918 (16.1) |
22,652 (18.9) |
14,352 (21.4) |
| 3 or more |
32,172 (6.9) |
1,385 (5.8) |
14,770 (5.8) |
9,256 (7.7) |
6,761 (10.1) |
|
Age Group, n (%) |
|
||||
| <20 |
51,227 (10.2) |
5,324 (20.8) |
31,066 (11.4) |
9,986 (7.7) |
4,851 (6.5) |
| 21-30 |
243,128 (48.4) |
13,496 (52.6) |
129,160 (47.5) |
62,807 (48.3) |
37,665 (50.6) |
| 31-40 |
198,598 (39.5) |
6,566 (25.6) |
107,276 (39.4) |
54,462 (41.9) |
30,294 (40.7) |
| >41 |
9,350 (1.9) |
257 (1.0) |
4,626 (1.7) |
2,802 (2.2) |
1,665 (2.2) |
|
Ethnic Group, n (%) |
|
||||
| South Asian |
47,867 (9.5) |
3,903 (15.2) |
18,396 (6.8) |
15,752 (12.1) |
9,816 (13.2) |
| Black |
22,250 (4.4) |
960 (3.7) |
9,498 (3.5) |
7,185 (5.5) |
4,607 (6.2) |
| Mixed |
5,797 (1.2) |
418 (1.6) |
3,274 (1.2) |
1,362 (1.0) |
743 (1.0) |
| Chinese or Other Ethnic Group |
11,067 (2.2) |
1,016 (4.0) |
6,371 (2.3) |
2,676 (2.1) |
1,004 (1.3) |
| White |
415,493 (82.7) |
19,353 (75.5) |
234,676 (86.2) |
103,130 (79.3) |
58,334 (78.3) |
|
Employment, n (%) |
|
||||
| Not Employed |
39,903 (11.0) |
3,178 (17.6) |
21,676 (11.0) |
9,130 (9.8) |
5,919 (11.0) |
| Housewife/Carer |
76,584 (21.2) |
4,864 (26.9) |
37,596 (19.1) |
20,278 (21.8) |
13,846 (25.7) |
| Higher Education |
7,397 (2.0) |
501 (2.8) |
4,134 (2.1) |
1,800 (1.9) |
962 (1.8) |
| School Age/Education under 18 years |
4,318 (1.2) |
543 (3.0) |
2,981 (1.5) |
589 (0.6) |
205 (0.4) |
| Employed |
233,264 (64.5) |
9,009 (49.8) |
130,191 (66.2) |
61,154 (65.8) |
32,910 (61.1) |
|
Deprivation Quintile, n (%) |
|
||||
| 1 Most Deprived |
115,162 (23.3) |
6,978 (27.8) |
55,649 (20.8) |
30,702 (23.9) |
21,833 (29.7) |
| 2 |
101,127 (20.4) |
5,437 (21.6) |
51,361 (19.2) |
27,302 (21.3) |
17,027 (23.1) |
| 3 |
91,508 (18.5) |
4,437 (17.6) |
49,724 (18.5) |
23,985 (18.7) |
13,362 (18.2) |
| 4 |
85,000 (17.2) |
3,801 (15.1) |
49,105 (18.3) |
21,539 (16.8) |
10,555 (14.3) |
| 5 Least Deprived | 102,454 (20.7) | 4,492 (17.9) | 62,311 (23.2) | 24,826 (19.3) | 10,825 (14.7) |
a Underweight BMI defined as <18.5 kg/m2 for all ethnic groups.
b Ideal BMI defined as 18.5-22.9 kg/m2 for Asian populations, and 18.5-24.9 kg/m2 for non-Asian populations.
c Overweight BMI defined as 23–27.4 kg/m2 for Asian populations, and 25.0-29.9 kg/m2 for non-Asian populations.
d Obese BMI defined as >27.5 kg/m2 for Asian populations, and ≥30 kg/m2 for non-Asian populations.
e BMI data were positively skewed therefore median and interquartile range also presented for comparison with the mean.