Nulliparous | Multiparous | |||||||
---|---|---|---|---|---|---|---|---|
FMU | AMU | FMU | AMU | |||||
n = 5187 | n = 8350 | n = 6078 | n = 8323 | |||||
n | % | n | % | n | % | n | % | |
Maternal age | ||||||||
Mean (SD) | 27.0 | (5.69) | 26.9 | (5.59) | 30.3 | (5.39) | 29.7 | (5.38) |
Under 20 | 578 | 11.2 | 906 | 10.9 | 98 | 1.6 | 158 | 1.9 |
20-24 | 1243 | 24.0 | 2064 | 24.8 | 886 | 14.6 | 1414 | 17.0 |
25-29 | 1538 | 29.7 | 2552 | 30.6 | 1720 | 28.3 | 2442 | 29.4 |
30-34 | 1314 | 25.4 | 2002 | 24.0 | 1930 | 31.8 | 2572 | 31.0 |
35-39 | 460 | 8.9 | 755 | 9.1 | 1230 | 20.3 | 1472 | 17.7 |
40+ | 47 | 0.9 | 56 | 0.7 | 207 | 3.4 | 242 | 2.9 |
Missing | 7 | 15 | 7 | 23 | ||||
Ethnic group | ||||||||
White | 4779 | 92.2 | 6930 | 83.2 | 5533 | 91.1 | 6523 | 78.5 |
Indian | 46 | 0.9 | 266 | 3.2 | 41 | 0.7 | 243 | 2.9 |
Pakistani | 57 | 1.1 | 180 | 2.2 | 107 | 1.8 | 364 | 4.4 |
Bangladeshi | 42 | 0.8 | 45 | 0.5 | 105 | 1.7 | 85 | 1.0 |
Black Caribbean | 24 | 0.5 | 104 | 1.2 | 24 | 0.4 | 94 | 1.1 |
Black African | 38 | 0.7 | 191 | 2.3 | 56 | 0.9 | 328 | 3.9 |
Mixed | 61 | 1.2 | 143 | 1.7 | 63 | 1.0 | 150 | 1.8 |
Other | 138 | 2.7 | 470 | 5.6 | 146 | 2.4 | 522 | 6.3 |
Missing | 2 | 21 | 3 | 14 | ||||
Understanding of English | ||||||||
Fluent | 5014 | 96.8 | 7633 | 91.8 | 5896 | 97.3 | 7530 | 90.8 |
Some | 142 | 2.7 | 560 | 6.7 | 131 | 2.2 | 613 | 7.4 |
None | 22 | 0.4 | 126 | 1.5 | 33 | 0.5 | 148 | 1.8 |
Missing | 9 | 31 | 18 | 32 | ||||
Marital/Partner status | ||||||||
Married/Living together | 4608 | 89.9 | 7241 | 88.0 | 5821 | 96.7 | 7745 | 94.4 |
Single/Unsupported | 519 | 10.1 | 985 | 12.0 | 199 | 3.3 | 461 | 5.6 |
Missing | 60 | 124 | 58 | 117 | ||||
Body mass index (kg/m 2 ) | ||||||||
Mean (SD) | 23.7 | (3.54) | 23.6 | (3.66) | 24.4 | (3.82) | 24.4 | (3.85) |
Not recorded | 889 | 17.2 | 1432 | 17.2 | 972 | 16.0 | 1483 | 17.9 |
10-18.4 | 121 | 2.3 | 243 | 2.9 | 113 | 1.9 | 194 | 2.3 |
18.5-24.9 | 2738 | 52.8 | 4419 | 53.1 | 2858 | 47.1 | 3783 | 45.7 |
25.0-29.9 | 1098 | 21.2 | 1713 | 20.6 | 1550 | 25.5 | 2071 | 25.0 |
30.0-35.0 | 336 | 6.5 | 521 | 6.3 | 575 | 9.5 | 748 | 9.0 |
Missing | 5 | 22 | 10 | 44 | ||||
Index of Multiple Deprivation (IMD) quintiles | ||||||||
1st Least deprived | 1090 | 21.1 | 1241 | 14.9 | 1405 | 23.2 | 1293 | 15.6 |
2nd | 1180 | 22.8 | 1357 | 16.3 | 1399 | 23.1 | 1281 | 15.4 |
3rd | 1094 | 21.2 | 1687 | 20.3 | 1206 | 19.9 | 1548 | 18.7 |
4th | 965 | 18.7 | 1984 | 23.8 | 1111 | 18.3 | 1860 | 22.4 |
5th Most deprived | 843 | 16.3 | 2058 | 24.7 | 941 | 15.5 | 2316 | 27.9 |
Missing | 15 | 23 | 16 | 25 | ||||
Previous pregnancies > =24 completed weeks | ||||||||
0 Nulliparous | 5187 | 100.0 | 8350 | 100.0 | N/A | N/A | N/A | N/A |
1 previous | N/A | N/A | N/A | N/A | 3913 | 64.4 | 5621 | 67.5 |
2 previous | N/A | N/A | N/A | N/A | 1513 | 24.9 | 1933 | 23.2 |
3+ previous | N/A | N/A | N/A | N/A | 652 | 10.7 | 769 | 9.2 |
Gestation (completed weeks) | ||||||||
Mean (SD) | 39.8 | (1.1) | 39.7 | (1.1) | 39.8 | (1.1) | 39.7 | (1.1) |
37 | 149 | 2.9 | 257 | 3.1 | 165 | 2.7 | 216 | 2.6 |
38 | 473 | 9.1 | 798 | 9.6 | 505 | 8.3 | 766 | 9.2 |
39 | 1155 | 22.3 | 1995 | 24.0 | 1512 | 24.9 | 2130 | 25.7 |
40 | 1965 | 38.0 | 3178 | 38.2 | 2392 | 39.4 | 3302 | 39.8 |
41 | 1379 | 26.7 | 1982 | 23.8 | 1439 | 23.7 | 1814 | 21.8 |
42-44 | 51 | 1.0 | 119 | 1.4 | 57 | 0.9 | 76 | 0.9 |
Missing | 15 | 21 | 8 | 19 | ||||
Birthweight (grams) | ||||||||
Mean (SD) | 3415 | (420.0) | 3405 | (423.2) | 3549 | (439.3) | 3519 | (441.7) |
1000-2499 g | 57 | 1.1 | 109 | 1.3 | 43 | 0.7 | 50 | 0.6 |
2500-2999 g | 725 | 14.0 | 1237 | 14.9 | 597 | 9.8 | 897 | 10.8 |
3000-3499 g | 2265 | 43.7 | 3581 | 43.0 | 2163 | 35.6 | 3171 | 38.2 |
3500-3999 g | 1676 | 32.3 | 2675 | 32.1 | 2342 | 38.6 | 3001 | 36.1 |
4000-4499 g | 417 | 8.0 | 665 | 8.0 | 828 | 13.6 | 1034 | 12.5 |
4500-7500 g | 46 | 0.9 | 56 | 0.7 | 100 | 1.6 | 149 | 1.8 |
Missing | 1 | 27 | 5 | 21 |