Relevant background variables
| Variables | Operationalisation | Data collection method |
|---|---|---|
| Date of birth | dd/mm/yyyy | Chart review |
| Date of diagnosis | dd/mm/yyyy | Chart review |
| Gender | Male/female | Chart review |
| Comorbidity | Yes/No | Chart review |
| Educational level | High/medium/low* | Survey |
| Type of education | Special education or not | Survey |
| Disability benefits | Yes/No | Survey |
*Low: junior vocational or secondary general low; medium: secondary general high or senior vocational; high: higher educational institutions or university.