Overview and study characteristics of analytic cohort samples
| Country* | FR | NL | UK | CZ | UA | FI | NO | SE | GR | IT | PT | ES |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Birth cohort | EDEN | ABCD | MCS† | ELSPAC | FCOU | NFBC8586 | HUMIS | ABIS | GBC | GASPII | G21 | INMA |
| Year(s) of birth | 2003/2006 | 2003/2004 | 2001/2002 | 1991/1992 | 1993/1996 | 1985/1986 | 2003/2006 | 1997/1999 | 1983 | 2003/2004 | 2005/2006 | 1997/2005 |
| N at birth‡ | 1903 | 7880 | 14 630 | 6933 | 4118 | 8993 | 2035 | 15 328 | 2044 | 636 | 8330 | 2466 |
| Per cent boys (N) | 52.6 (1000) | 50.4 (3969) | 51.0 (7467) | 51.8 (3593) | 52.7 (2170) | 51.3 (4617) | 52.4 (1066) | 51.7 (7920) | 46.6 (953) | 50.8 (323) | 51.1 (4259) | 51.6 (1272) |
| Per cent girls (N) | 47.5 (903) | 49.6 (3911) | 49.0 (7163) | 48.2 (3340) | 47.3 (1948) | 48.7 (4376) | 47.6 (969) | 48.3 (7408) | 53.4 (1091) | 49.2 (313) | 48.9 (4071) | 48.4 (1194) |
| Mother's characteristics at time of birth | ||||||||||||
| Educational classification, %§ | ||||||||||||
| High | 51.7 | 36.5 | 21.1 | 25.5 | 33.6 | 17.5 | 70.7 | 26.7 | 10.6 | 27.4 | 14.8 | 21.9 |
| Medium | 36.1 | 28.1 | 41.3 | 38.2 | 61.8 | 51.1 | 23.6 | 25.8 | 20.5 | 47.5 | 19.4 | 34.7 |
| Low | 12.2 | 35.3 | 37.6 | 36.3 | 4.7 | 31.4 | 5.7 | 47.5 | 68.9 | 25.1 | 65.8 | 43. 3 |
| Age (years), mean | 29.5 | 30.7 | 28.9 | 25.3 | 23.8 | 27.8 | 29.9 | 30.2 | 25.8 | 32.9 | 29.0 | 31.4 |
| Ethnic minority, % | 4.0 | 29.7 | 10.8 | 1.1 | 0 | 0 | 11.4 | 0 | 0 | 6.0 | 3.3 | 6.0 |
| Birth outcomes | ||||||||||||
| Preterm birth, % | 5.8 | 5.7 | 6.8 | 1.7 | 5.8 | 4.4 | 3.4 | 3.7 | 4.7 | 4.4 | 7.5 | 4.6 |
| Small for gestational age, % | 11.4 | 7.4 | 10.9 | 11.7 | 7.8 | 4.8 | 5.4 | 4.6 | 8.5 | 9.1 | 12.7 | 15.3 |
*Country abbreviations represent France (FR), the Netherlands (NL), the UK (UK), the Czech Republic (CZ), Ukraine (UA), Finland (FI), Norway (NO), Sweden (SE), Greece (GR), Italy (IT), Portugal (PT) and Spain (ES).
†Descriptive data of the MCS sample use survey weights to account for the cohort study's sampling design.
‡Approximate sample sizes from which health outcome data for the present analysis were ascertained.
§Educational levels in each country have been age-standardised to the WHO European Standard Population.
MCS, Millennium Cohort Study.