Participant characteristics
| Intellectual disabilities n=26 349 (100%) n (%) | No intellectual disabilities n=5 269 054 (100%) n (%) | |
| Gender* | ||
| Males | 15 149 (57.5) | 2 552 295 (48.4) |
| Females | 11 200 (42.5) | 2 716 759 (51.5) |
| Age groups (years)* | ||
| 0–15 | 5234 (19.9) | 916 097 (17.3) |
| 16–24 | 4162 (15.8) | 628 326 (11.9) |
| 25–34 | 3475 (13.2) | 663 854 (12.6) |
| 35–44 | 3859 (14.6) | 730 895 (13.9) |
| 45–54 | 4301 (16.3) | 782 455 (14.9) |
| 55–64 | 2863 (10.9) | 664 550 (12.6) |
| 65–74 | 1567 (5.9) | 480 225 (9.1) |
| 75+ | 888 (3.4) | 407 654 (7.7) |
| Living arrangements* | ||
| Private household | 23 016 (87.4) | 5 173 370 (98.2) |
| Communal establishment | 3333 (12.6) | 95 684 (1.8) |
| Country of birth* | ||
| UK | 25 599 (97.2) | 4 900 520 (93.0) |
| Other Europe | 298 (1.1) | 171 945 (3.3) |
| Africa | 120 (0.5) | 46 622 (0.9) |
| Middle East and Asia | 205 (0.8) | 104 325 (1.9) |
| The Americas and the Caribbean | 93 (0.4) | 33 320 (0.6) |
| Other | 34 (0.1) | 12 382 (0.2) |