Table 2.
Neuropsychological Test Scores for Each Group
| HC | SIB | PSZ | |
|---|---|---|---|
| aIQ | 116 ± 12 | 120 ± 10* | 110 ± 12 |
| TAP | |||
| Working memory (omission) | 1.7 ± 2.7* | 1 ± 2.1** | 3.8 ± 3.4 |
| Incompatibility (response) | 28.7 ± 1.2 | 29.3 ± 0.6 | 27.3 ± 4.7 |
| Incompatibility (ms) | 468 ± 127 | 499 ± 77 | 536 ± 99 |
| Divided attention (auditory-omission) | 1.1 ± 1** | 1 ± 1** | 4.9 ± 5.3 |
| Divided attention (visual-omission) | 0.2 ± 0.7* | 0.07 ± 0.3 | 2.3 ± 4.4 |
| Stroop | |||
| Interference (errors) | 0.9 ± 1.1* | 0.6 ± 0.8* | 1.9 ± 1.7 |
| Interference (total time, s) | 94 ± 39 | 89 ± 38 | 121 ± 56 |
| NSS | 7.5 ± 3.4** | 7.3 ± 3.9** | 13.2 ± 6.1 |
| SAS [0–40] | 1.5 ± 1.2* | 1.2 ± 1.3* | 3.3 ± 3.4 |
Note: PSZ, patients with schizophrenia; SIB, unaffected siblings; HC, healthy control subjects; aIQ, approximated intelligence quotient; TAP, Test battery for Attentional Performance, NSS, neurological soft signs; SAS, Simpson-Angus Extrapyramidal Scale. Mean ± SD values for the group of PSZ, SIB, and HC. Tests: aIQ, TAP, Stroop, NSS (total score), and SAS. In bracket: min–max score of the respective scale. HC and SIB scores significantly different from PSZ group: *P < .05; **P < .01, t test. None of the differences between SIB and HC scores were significantly different.