Summary of study measures
| Measure | Purpose |
| Phase I (non-ID participants only) | |
| Autism Quotient, AQ41 | Measuring likelihood of ASD. |
| Informant version of the Social Responsiveness Scale,second edition, SRS-A45 | |
| Self-report and Informant versions of the Adult Social Behaviour Questionnaire, ASBQ46 | |
| Self-report and Informant versions of the EuroQol-5D-5L, EQ-5D-5L47 | Measuring quality of life. |
| Basic information form | Collecting information pertaining to patient demographics, as well as the 2014 Adult Psychiatric Morbidity Survey (APMS) mental illness and physical health conditions checklists.13 |
| Phase I I | |
| Diagnostic Interview for Social and Communication Disorders, DISCO48 | Establishing whether participant meets diagnostic criteria for ASDs. |
| Autism Diagnostic Observation Schedule version 2, ADOS-249 | |
| The Mental Illness Diagnoses and Treatment section of the 2014 APMS13 | Establishing participant’s psychiatric and physical health comorbidities. |
| The Physical Health Conditions section of the 2014 APMS13 | |
| ASD interview subsection of version 3 of the Schedules for Clinical Assessment in Neuropsychiatry, ASD-SCAN-3 | Field testing of interview schedule (for non-ID participants only). |
| Stigma Questionnaire for people with Intellectual Disability, SQID50 | Participants experience of stigma (for ID participants only). |
| Basic information form | Collecting information pertaining to patient demographics, as well as the 2014 Adult Psychiatric Morbidity Survey (APMS) mental illness and physical health conditions checklists13 (for ID participants only, as this form is completed in phase I for non-ID participants). |
ID, intellectual disability.