Descriptive statistics of the overall sample and the subsample used for evaluation of repeatability
| Overall sample | Subsample | |
| n | 716 | 301 |
| Age (years), mean±SD | 71.9±7.0 | 71.2±7.2 |
| Gender, n (%) | ||
| Female | 465 (65) | 187 (62) |
| Male | 251 (35) | 114 (38) |
| AMD stage, n (%) | ||
| Intermediate AMD | 584 (82)* | 168 (56) |
| No AMD | 56 (8) | 56 (19) |
| Early AMD | 34 (5) | 34 (11) |
| Late AMD | 42 (6) | 43 (14) |
| Mode of administration, n (%) | ||
| Self-administration | 191 (27) | 67 (22) |
| Interviewer administration | 525 (73) | 234 (78) |
| Response language, n (%) | ||
| German | 241 (34) | 88 (29) |
| English | 90 (13) | 27 (9) |
| Danish | 30 (4) | 12 (4) |
| Dutch | 73 (10) | 39 (13) |
| French | 77 (11) | 32 (11) |
| Italian | 87 (12) | 26 (9) |
| Portuguese | 118 (16) | 77 (26) |
*Questionnaire data of two participants were not included in the overall psychometric evaluation.
AMD, age-related macular degeneration.