| Comment | na | Coded as age range | Explanation |
| Early 20s | 1/0/0 | ≥19 years | - |
| Elementary school | 3/0/1 | 6 - 9 years | - |
| Childhood | 8/0/7 | 6 - 9 years | To distinguish from early childhood, the next category was chosen |
| Early Childhood | 1/0/1 | 2 - 5 years | - |
| Always | 9/0/6 | 2 - 5 years | Coded as earliest category |
| Since the Beginning | 1/0/0 | 2 - 5 years | Coded as earliest category |
| Always, worse at 12 years | 1/0/0 | 10 - 13 years | Coded as category that includes 12 years, as participant specifically referred to aggravation of symptoms at age 12 |
| School age | 1/0/0 | 6 - 9 years | Coded as elementary school age |
| Youth | 0/1/1 | 14 - 16 years | Coded based on German law: “youth” starting at 14 years of age |
| Before 12 years | 3/0/0 | 6 - 9 years | Only refers to ADHD-diagnoses, manifestation before 12 years of age is a diagnostic criterium for the diagnosis. Coded as category before the category that includes 12 years of age |