Socioeconomic and demographic information for wave 1 Cerebra 1000 Families sample: parent and family
| Primary caregiver and family | |
| Female primary caregiver | 1005 (84.9%) |
| Primary caregiver relationship to child | |
| Biological mother | 923 (78%) |
| Adoptive mother | 53 (4.5%) |
| Biological father | 46 (3.9%) |
| Grandmother | 13 (1.1%) |
| Missing information | 129 (10.9%) |
| Primary caregiver employment status | |
| In a job working for an employer | 391 (33.0%) |
| Looking after home and family | 388 (32.8%) |
| Self-employed | 103 (8.7%) |
| Doing something else | 100 (8.4%) |
| Missing information | 129 (10.9%) |
| Primary caregiver education level | |
| Degree level | 465 (39.3%) |
| Higher education but below degree level | 253 (21.4%) |
| A/AS levels or equivalent | 104 (8.8%) |
| 5 or more GCSEs at A*-C or equivalent | 74 (6.3%) |
| Some GCSEs passes or equivalent | 93 (7.9%) |
| No qualifications | 13 (1.1%) |
| Missing information | 179 (15.1%) |
| Primary caregiver relationship status | |
| Married and living with spouse/civil partner | 631 (53.3%) |
| Divorced/separated/single/widowed/not currently living with partner | 226 (19.1%) |
| Living with partner | 141 (11.9%) |
| Missing information | 186 (15.7%) |
| Primary caregiver ethnicity | |
| White British | 930 (78.5%) |
| White other (Irish, travelling community, other) | 55 (5.2%) |
| Asian/Asian British | 26 (2.3%) |
| Black (African/Caribbean/Black British) | 15 (1.3%) |
| Remaining ethnic groups (mixed/multiple ethnicity, Arabic, any other ethnic background, etc) | 23 (2.0%) |
| Missing information | 135 (11.4%) |
| Country | |
| England | 1031 (87.1%) |
| Scotland | 48 (4.1%) |
| Wales | 83 (7.0%) |
| Northern Ireland | 9 (0.76%) |
| Missing | 13 (1.10%) |
| Family living in most deprived 10% of neighbourhoods based on indices of multiple deprivation (IMD) | 90 (7.6%) |
| Missing IMD information | 34 (2.9%) |
| Child with ID has a sibling aged between 4 and 15 years 11 months | |
| Yes | 612 (51.7%) |
| No | 360 (30.4%) |
| Missing information | 212 (17.9%) |
| Nearest-in-age sibling of child with ID has a longstanding illness, disability or infirmity | |
| Yes | 168 (27.5%) |
| No | 439 (71.4%) |
| Missing information (from those who indicated child has sibling in age range) | 5 (0.8%) |
A/AS levels, GCE Advanced level; GCSE, General Certificate of Secondary Education; ID, intellectual disability.