Table 1.
The number of participants in each of the two samples used in this study, subset by demographic characteristics.
| ALSPAC cohort | Main sample | Sub-sample | |
|---|---|---|---|
| Characteristic | N = 14,901 | N = 4083 | N = 2991 |
| Sex | |||
| Female | 49% | 66% | 69% |
| Male | 51% | 34% | 31% |
| Missing (N) | 23 | ||
| Ethnicity | |||
| Ethnic Minority Groups | 5.0% | 3.7% | 3.5% |
| White | 95% | 96% | 97% |
| Missing (N) | 2829 | 461 | 332 |
| A Levels | |||
| No | 23% | 19% | 19% |
| Yes | 77% | 81% | 81% |
| Missing (N) | 10,801 | 1384 | 786 |
| Parental Employment Classa | |||
| Non-manual | 68% | 76% | 77% |
| Manual | 32% | 24% | 23% |
| Missing (N) | 3406 | 566 | 407 |
aParental employment was collected pre-birth of participants.