Table I.
Socio‐Demographic Description of the Samples
| 22q11.2DS ADHD (%) | Clinical ADHD (%) | Population cohort ADHD (%) | χ2 | P | |
|---|---|---|---|---|---|
| Social group | |||||
| Low | 8 | 54 | 0 | 95.2 | <0.001 |
| Middle | 73 | 33 | 46 | ||
| High | 19 | 13 | 54 | ||
| Mother's highest educational qualification | |||||
| None | 12 | 28 | 15 | 31.6 | <0.001 |
| GCSEs or O'levels | 33 | 49 | 50 | ||
| A levels | 33 | 13 | 27 | ||
| Degree or higher | 23 | 9 | 8 |
SES was classified based on the occupation of the main family wage earner using the UK Standard Occupation Classification (Office of National Statistics, 2001). Three SES categories were defined (low: unskilled workers/unemployed; medium: manual and non‐manual skilled/partially skilled workers; high: professional and managerial workers).