Table 1.
Characteristics of cohort at study entry. Values are numbers (percentages) unless stated otherwise
| Characteristic | Value (n=33 016) |
|---|---|
| Mean (SD) age, years | 36.3 (16.4) |
| Median (interquartile range) follow-up time, years | 5.5 (2.2-11.5) |
| Male sex | 19 139 (58) |
| Autism | 4925 (15) |
| Epilepsy | 7517 (23) |
| Dementia | 319 (1) |
| History of mental illness | 7065 (21) |
| Severe mental illness | 2364 (7) |
| Schizophrenia | 1313 (4) |
| Bipolar disorder | 439 (1) |
| Psychosis, other | 612 (2) |
| Depression (including mixed anxiety-depression) | 3620 (11) |
| Anxiety | 1845 (6) |
| History of challenging behaviour | 8300 (25) |
| History of psychotropic drug prescription | 16 242 (49) |
| Antipsychotic | 7028 (21) |
| Antidepressant | 6614 (20) |
| Mood stabiliser | 6698 (20) |
| Anxiolytic/hypnotic | 7152 (22) |
| Antidementia drugs | 254 (0) |
| Drugs for attention-deficit/hyperactivity disorder | 623 (2) |