Overview of the instruments we used, clarifying domains and concepts
| Domain | Concept | Instrument | (Sub)scale/item |
| Family | |||
| Current living situation | Demographic questionnaire | Living Situation (Item) | |
| Spatial independence | Demographic questionnaire | Distance from Parents (Item) | |
| Relationship with the parents | Kidscreen-27 | Autonomy & Parent Relation Subscale | |
| Education and profession | |||
| Educational level | Demographic questionnaire | Highest Completed Education (Item) | |
| Repeated school years | Demographic questionnaire | Number of Repeated School Years (Item) | |
| Employment situation | Demographic questionnaire | Current Employment Situation (Item) | |
| Financial situation | Demographic questionnaire | Maintaining Livelihood (Item) | |
| Partnership | |||
| Marital status | Demographic questionnaire | Marital Status (Item) | |
| Partner status | Demographic questionnaire | Partner Status (Item) | |
| Duration of longest relationship | Demographic questionnaire | Duration of Longest Relationship (Item) | |
| Social environment | |||
| Social support in general | F-SozU | F-SozU Total Score | |
| Social support by peers | Kidscreen-27 | Subscale Perceived Social Support & peers | |
| Feelings about school | Kidscreen-27 | Subscale School | |
| Social functioning | SF-36 | Subscale Self-Rated Social Function | |
| Reintegration after PHTX | Demographic questionnaire | Reintegration at School (item) | |
| Subjective physical well-being | |||
| Subjective physical complaints | GBB | Total Score | |
| Fatigue Tendency | GBB | Subscale Fatigue Tendency | |
| Gastric Complaints | GBB | Subscale Gastric Complaints | |
| Limb Pain | GBB | Subscale Limb Pain | |
| Heart Complaints | GBB | Subscale Heart Complaints | |
| Physical well-being | Kidscreen-27 | Subscale Physical Well-Being | |
| Subjective psychological well-being | |||
| Psychological well-being | Kidscreen-27 | Subscale Psychological Well-Being | |
| QOL | |||
| Physical functioning | SF-36 | Subscale Physical Functioning | |
| General health | SF-36 | Subscale General Health | |
| Physical limits in everyday functioning | SF-36 | Subscale Physical Role | |
| Pain | SF-36 | Subscale Bodily Pain | |
| Physical quality of life | SF-36 | Physical Summary Scale | |
| Vitality | SF-36 | Subscale Vitality | |
| Social functioning | SF-36 | Subscale Social Functioning | |
| Emotional limits in everyday functioning | SF-36 | Subscale Emotional Role | |
| Mental health | SF-36 | Subscale Mental Health | |
| Psychological quality of life | SF-36 | Mental Summary Scale | |
GBB, Gießener Beschwerde-Bogen; SF-36, Short-Form-36.