Table 3.
Correlation between neuropsychological tests, AES-C-Apathy and possible confounding variables
| Test (N) | AES-C-Apathy | CDSS | PANSS Positive | DDD-AP |
| r | r | r | r | |
| IQ | ||||
| Premorbid: NART | .11 | <.01 | .25* | .11 |
| Current: WASI | -.15 | -.02 | -.11 | -.23 |
| Motor function | ||||
| Grooved Pegboard | .09 | -.02 | .14 | .18 |
| Psychomotor speed | ||||
| Digit symbol | -.17 | -.04 | -.11 | -.15 |
| Attention | ||||
| Digit span forwards | -.13 | .02 | .04 | -.14 |
| Verbal memory | ||||
| CVLT-II | -.15 | .05 | -.15 | -.13 |
| Visual memory | ||||
| ROCF long term memory | -.16 | -.05 | -.10 | -.21 |
| Working memory | ||||
| Letter Number Span | -.26* | -.07 | -.13 | -.13 |
| Executive function | ||||
| Initiation | ||||
| Phonetic fluencya | -.25* | -.08 | < -.01 | -.17 |
| Semantic fluencya | -.37** | -.05 | -.04 | -.11 |
| Set shifting | ||||
| Category switching | -.18 | .06 | .02 | -.24* |
| Inhibition | ||||
| Color-Word Interference | .23 | .10 | .25* | .10 |
r = Pearson product moment correlation; *p <.05; a Bonferroni corrected (0.05/2 = .03) * = p ≤ .03; ** = p ≤ .01
Abbreviations: NART, National Adult Reading Test; WASI, Wechsler Abbreviated Scale of Intelligence; CVLT-II, California Verbal Learning Test II; ROCF, Rey-Osterrieth Complex Figure Test; AES-C-Apathy, abridged Apathy Evaluation Scale; CDSS, Calgary Depression Scale for Schizophrenia; PANSS, Positive and Negative Syndrome Scale; DDD-AP, indicates defined daily dose according to the World Health Organization of Antipsychotic medication