Table 2.
Sample characteristics by ADHD outcome (> 7 years)
| ASD sample characteristics | No ADHD N(%) 2427 (75.0) |
With ADHD N(%) 810 (25.0) |
|---|---|---|
| Early childhood onset epilepsy, N (%) | 76 (3.1%) | 45(5.6%) |
| Female, N (%) | 586 (24.1) | 133 (16.4) |
| Age at ASD diagnostic coding, mean (SD) | 11.22 (3.7) | 10.7 (3.60) |
| Age group N (%) | ||
| 3–6 years | 261 (10.8) | 71 (8.77) |
| 6–12 years | 1085 (44.7) | 430 (53.1) |
| 12–18 years | 1081 (44.5) | 309 (22.2) |
| Ethnicity, N (%) | ||
| White British | 1083 (44.6) | 458 (56.5) |
| White other | 108 (4.5) | 36 (4.4) |
| East Asian/ British East Asian | 48 (2.0) | 9 (1.1) |
| Black African/ British Black African | 495 (20.4) | 114 (14.1) |
| African-Caribbean/ British African-Caribbean | 88 (3.6) | 31 (3.8) |
| Mixed | 259 (10.7) | 96 (11.9) |
| South Asian/ British South Asian | 66 (2.7) | 14 (1.7) |
| Other | 280 (11.5) | 52 (6.42) |
| Neighbourhood deprivation, N (%) | ||
| 1st (least deprived) | 536 (22.4) | 217 (27.2) |
| 2nd | 572 (23.9) | 221 (27.6) |
| 3rd | 645 (27.0) | 179 (22.4) |
| 4th (most deprived) | 638 (26.7) | 182 (22.8) |
| Intellectual disability, N (%) | 471 (19.4) | 176 (21.7) |
| Family history of epilepsy, N (%) | 77 (3.2) | 24 (3.0) |
| Physical risk factors, N (%) | ||
| CNS Infection | 13 (.54) | ≤ 5a |
| Any Tumour | ≤ 5a | ≤ 5a |
| Autoimmune Disease | ≤ 5a | ≤ 5a |
| Endocrine/metabolomic disorder | ≤ 5a | 14 (1.7) |
| CNS Myodegeneration | 36 (1.5) | 13 (1.6) |
| Perinatal Complications | 153 (6.3) | 85 (10.5) |
| Congenital Malformations | 113 (4.7) | 48 (5.9) |
| Head Injury | 60 (2.5) | 35 (4.3) |
| CNS Infection | 77 (3.2) | 24 (3.0) |
| Any physical of the above physical factors | 325 (13.4) | 160 (19.8) |
aactual numbers suppressed to reduce risk of statistical disclosure