Comparison of the ALSPAC-enrolled sample, those who completed the CIS-R and the sample for whom we have linked GP data in terms of socioeconomic characteristics and CIS-R outcomes
| Singletons and twins enrolled in ALSPAC, alive at 1 year and who have not withdrawn from the study (n=14 684)* | Completed the CIS-R at 17–18 years (n=4563)* | Completed the CIS-R and in linked GP data set† (n=1562)* | |
|---|---|---|---|
| Sex | |||
| Male | 7536 (51.3%) | 1996 (43.7%) | 632 (40.5%) |
| Female | 7148 (48.7%) | 2.567 (56.3%) | 930 (59.5%) |
| Maternal age | |||
| <20 | 650 (4.7%) | 76 (1.8%) | 12 (0.8%) |
| 20–24 | 2688 (19.2%) | 566 (13.2%) | 159 (10.6%) |
| 25–29 | 5403 (38.7%) | 1621 (37.8%) | 545 (36.3%) |
| 30–34 | 3848 (27.5%) | 1465 (34.2%) | 567 (37.7%) |
| 35+ | 1383 (9.9%) | 561 (13.1%) | 219 (14.6%) |
| Parity | |||
| 0 | 5769 (44.6%) | 2011 (48.4%) | 718 (48.7%) |
| 1 | 4539 (35.1%) | 1450 (34.9%) | 526 (35.7%) |
| 2 | 1849 (14.3%) | 520 (12.5%) | 179 (12.1%) |
| 3+ | 767 (5.9%) | 173 (4.2%) | 51 (3.5%) |
| Ethnicity | |||
| White | 11 469 (95.0%) | 3917 (95.7%) | 1409 (96.1%) |
| Non-white | 609 (5.0%) | 176 (4.3%) | 58 (4.0%) |
| Mother's education | |||
| O level/lower | 8021 (64.6%) | 2195 (52.9%) | 708 (47.8%) |
| A level | 2792 (22.5%) | 1162 (28.0%) | 425 (28.7%) |
| Degree/higher | 1599 (12.9%) | 792 (19.1%) | 347 (23.5%) |
| Father's education | |||
| O level/lower | 6662 (55.8%) | 1875 (46.3%) | 605 (41.5%) |
| A level | 3105 (26.0%) | 1167 (28.8%) | 420 (28.8%) |
| Degree/higher | 2168 (18.2%) | 1009 (24.9%) | 433 (29.7%) |
| CIS-R diagnosis of depression | |||
| No | – | 4203 | 1447 |
| Yes | – | 360 (7.9%) | 115 (7.4%) |
| CIS-R diagnosis of CMD | |||
| No | – | 3884 | 1349 |
| Yes | – | 679 (14.9%) | 213 (13.6%) |
*The denominators vary because the variables come from different data sources and not all are complete.
†Up to at least 6 months beyond the date of completion of the CIS-R.
ALSPAC, Avon Longitudinal Study of Parents and Children; CIS-R, revised Clinical Interview Schedule; CMD, common mental disorder; GP, general practitioner.