Sociodemographic characteristics of the imaging sample
| Characteristic | Low delusional ideation* (n = 24) | High delusional ideation* (n = 24) | t value | p value |
|---|---|---|---|---|
| Age, yr | 25.29 ± 4.77 (19/42) | 23.54 ± 5.35 (18/40) | t46 = 1.196 | 0.24 |
| Sex, M/F | 16/8 | 16/8 | — | 0.77 |
| Verbal IQ score | 104.38 ± 6.14 (90/115) | 105.62 ± 6.65 (85/115) | t46 = −0.677 | 0.50 |
| Education, yr | 16.46 ± 2.41 (13/20.5) | 16.05 ± 3.55 (12/23) | t31 = 0.365 | 0.72 |
| Trail Making Test A score | 22.67 ± 8.71 (0/40) | 26.42 ± 6.98 (17/40) | t46 = −1.646 | 0.11 |
| Trail Making Test B score | 51.79 ± 23.93 (0/110) | 49.96 ± 12.01 (32/72) | t46 = 0.335 | 0.74 |
| Digit Span test score | 7.33 ± 2.24 (5/13) | 8.375 ± 2.18 (5/12) | t46 = −1.632 | 0.11 |
| PDI score, total | 2.08 ± 2.10 (0/6) | 12.33 ± 1.99 (10/17) | t46 = −17.327 | < 0.001 |
| PDI score, distress | 4.17 ± 4.27 (0/13) | 31.75 ± 11.04 (13/64) | t46 = −11.421 | < 0.001 |
| PDI score, preoccupation | 4.38 ± 5.19 (0/17) | 31.38 ± 7.131 (17/44) | t46 = −14.997 | < 0.001 |
| PDI score, conviction | 6.33 ± 7.56 (0/23) | 35.83 ± 10.76 (18/67) | t46 = −10.991 | < 0.001 |
| SPQ score | 9.48 ± 9.15 (0/41) | 23.70 ± 14.67 (5/73) | t42 = −3.813 | < 0.001 |
| d′, 0-back | 6.31 ± 0.82 (4.48/6.81) | 5.73 ± 1.23 (3.13/6.81) | t46 = 1.938 | 0.06 |
| d′, 2-back | 3.00 ± 1.01 (1.76/5.47) | 3.10 ± 1.04 (0.92/5.47) | t46 = −0.324 | 0.75 |
| Reaction time, 0-back, ms | 453.17 ± 105.93 (309/725) | 475.72 ± 107.16 (321/648) | t46 = −0.733 | 0.47 |
| Reaction time, 2-back, ms | 626.45 ± 125.74 (452/941) | 628.69 ± 117.46 (438/879) | t46 = −0.064 | 0.95 |
F = female; M = male; PDI = Peters Delusion Inventory; SPQ = Schizotypal Personality Questionnaire.
↵* Data are presented as mean ± standard deviation (minimum/maximum).