Table 2.
Descriptive and Inferential Statistics for the 3 Psychotic Experiences Groups With Psychosis Risk Score and Brain Volume
| Variable | Healthy Controls | Transient PEs | Persistent PEs | Test Statistic |
|---|---|---|---|---|
| n = 246 | 111 | 67 | 68 | |
| Agea | 20.2 (0.7) | 20.1 (0.6) | 20.2 (0.5) | |
| Female | 68 (61.26%) | 47 (70.15%) | 45 (66.18%) | χ2(2, 246) = 1.50, P = .47 |
| Male | 43 (38.74%) | 20 (29.85%) | 23 (33.82%) | |
| IQ | 112.3 (14.8) | 104.9 (14.0) | 106.0 (14.1) | F 2,243 = 7.01, P = .001b |
| TBVc | 1469.9 (130.9) | 1430.7 (155.6) | 1457.5 (153.0) | F 2,243 = 1.55, P = .214 |
| CIS-R | 4 (10) | 7 (12) | 11 (18) | χ2 (2) = 19.07, P < .001d |
| n = 180 | 79 | 51 | 50 | |
| Age | 20.1 (0.7) | 20.1 (0.7) | 20.0 (0.6) | |
| Female | 47 (40.50%) | 34 (66.67%) | 31 (62.00%) | χ2(2, 180) = 0.49, P = .78 |
| Male | 32 (59.49%) | 17 (33.33%) | 19 (38.00%) | |
| IQ | 112.2 (15.1) | 104.6 (15.8) | 108.1 (13.3) | F 2,177 = 4.22, P = .016e |
| TBVb | 1471.6 (125.3) | 1443.4 (161.3) | 1469.1 (149.6) | F 2,177 = 0.67, P = .515 |
| PRS | 0.06 (0.90) | −0.15 (1.25) | −0.07 (1.09) | F 2,177 = 0.62, P = .538 |
CSI-R, revised Clinical Interview Schedule; HC, healthy controls; IQ, intelligence quotient; PEs, psychotic experiences; PRS, polygenic risk score.
aAge is reported for 110 healthy controls, 66 transient PEs, and 68 persistent PEs.
bPost hoc comparisons using Bonferroni correction revealed that only HC differed from the other groups with PEs.
cTotal brain volume (TBV) is reported in cm3.
dPost hoc comparisons using Bonferroni correction showed that persistent PEs scored significantly higher than HC.
ePost hoc comparison revealed only a difference between HC and transient PEs.