Number of valid test scores, missing values due to test behavioural disturbances, and missing values due to other reasons (missing, other reasons)
| Tests | Valid | Missing values due to behavioural disturbances |
Missing (other reasons) |
| Orientation | 28 | 2 | 1 |
| Boston naming test (abbreviated) | 27 | 3 | 1 |
| GIT (abbreviated) | 18 | 10 | 3 |
| Similarities (WAIS) | 20 | 9 | 2 |
| Proverbs (information WAIS) | 25 | 5 | 1 |
| Digit symbol (WAIS) | 18 | 11 | 2 |
| Trail making part A | 24 | 6 | 1 |
| Trail making part B | 12 | 18 | 1 |
| Modified Wisconsin card sorting test | 11 | 17 | 3 |
| Category fluency animals (GIT) | 29 | 2 | |
| Category fluency professions (GIT) | 26 | 5 | |
| Digit span (WAIS) | 26 | 2 | 3 |
| Word list learning tests | 21 | 6 | 4 |
| Drawing clockface | 29 | 1 | 1 |
GIT=Groninger intelligentie test; WAIS=Wechsler adult intelligence scale; word list learning tests: Dutch versions of California verbal learning test and auditory verbal learning test and word list memory test from the CERAD.