Table 1.
Demographic and health behaviour characteristics of participants included for 1-year follow-upa
| Ethnicity (language of enrolment) |
|||||
|---|---|---|---|---|---|
| White British (English) (n = 3546) |
Pakistani (English) (n = 2602) |
Other (English) (n = 1209) |
Any ethnicity (Not English) (n = 1634) |
Total (n = 8991) |
|
| Age, years: mean (s.d.) | 26.7 (6.1) | 27.6 (5.1) | 28.0 (5.5) | 27.8 (5.4) | 27.3 (5.6) |
| Parity, n (%) | |||||
| Nulliparous | 1754 (50.6) | 937 (37.2) | 597 (50.2) | 517 (32.3) | 3805 (43.4) |
| 1 | 1024 (29.5) | 613 (24.3) | 329 (27.7) | 401 (25.1) | 2367 (27.0) |
| 2–3 | 602 (17.4) | 794 (31.5) | 237 (19.9) | 518 (32.4) | 2151 (24.5) |
| 4+ | 87 (2.5) | 176 (7.0) | 27 (2.3) | 163 (10.2) | 453 (5.2) |
| Missing | 79 (2.2) | 82 (3.2) | 19 (1.6) | 35 (2.1) | 215 (2.4) |
| Marital/cohabitation status, n (%) | |||||
| Married | 1100 (31.1) | 2370 (91.2) | 860 (71.1) | 1563 (96.0) | 5893 (65.7) |
| Cohabiting | 1401 (39.6) | 15 (0.6) | 163 (13.5) | 4 (0.3) | 1583 (17.6) |
| Not living with a partner | 1037 (29.3) | 213 (8.2) | 186 (15.4) | 62 (3.8) | 1498 (16.7) |
| Missing | 8 (0.2) | 4 (0.2) | 0 | 5 (0.3) | 17 (0.2) |
| Country of birth and age at migration, n (%) | |||||
| Born in UK | 3486 (98.5) | 1734 (67.4) | 476 (40.1) | 32 (2.0) | 5728 (64.3) |
| Immigrated before age 16 | 40 (1.1) | 394 (15.3) | 134 (11.3) | 73 (4.6) | 641 (7.2) |
| Immigrated 16 or older | 14 (0.4) | 433 (16.7) | 578 (48.7) | 1501 (93.5) | 2536 (28.5) |
| Missing | 6 (0.2) | 31 (1.2) | 21 (1.7) | 28 (1.7) | 89 (1.0) |
| Further pregnancies in the 12-month postnatal period, n (%) | |||||
| No | 3299 (93.0) | 2277 (87.5) | 1126 (93.1) | 1375 (84.2) | 8077 (89.8) |
| Yes | 247 (7.0) | 325 (12.5) | 83 (6.9) | 259 (15.9) | 914 (10.2) |
| Smoking during pregnancy, n (%) | |||||
| No | 2329 (65.7) | 2461 (94.8) | 1067 (88.4) | 1621 (99.4) | 7478 (83.3) |
| Yes | 1214 (34.3) | 134 (5.2) | 140 (11.6) | 10 (0.6) | 1498 (16.7) |
| Missing | 3 (0.1) | 7 (0.3) | 2 (0.2) | 3 (0.2) | 15 (0.2) |
| General practitioner visits,b mean (s.d.) | 24.3 (13.0) | 27.5 (15.1) | 22.6 (12.0) | 25.4 (13.6) | 25.2 (13.7) |
a.
See online Table DS2 for a version of this table that includes a wider range of characteristics. Proportions presented in categories are the proportion of observed (non-missing) data, missing is the proportion of data missing overall.
b.
Proxy used for the number of visits between 6 months prior to conception and 1 year post-delivery.