Table 1.
Sociodemographic, clinical, and theory of mind (ToM) task performance characteristics of subjects.
| FEP (n = 37) | HCs (n = 80) | Statistics (df) | p value | |
|---|---|---|---|---|
| Age (years) | 23.05 (5.64) | 22.99 (4.76) | 0.066 (116) | 0.947 |
| Sex (M/F) | 16/21 | 48/32 | 2.867 (1) | 0.090 |
| IQ | 98.49 (13.66) | 112.43 (12.62) | −5.413 (116) | <0.001** |
| Handedness (R/L) | 32/5 | 75/5 | 1.708 (1) | 0.191 |
| PANSS total | 67.73 (12.58) | |||
| Positive symptoms | 16.32 (4.49) | |||
| Negative symptoms | 16.97 (4.84) | |||
| General symptoms | 34.43 (6.83) | |||
| Medication (medicated/drug-naïve; average olanzapine-equivalent dose in mg/day) | 30/7 (11.64) | |||
| False belief total score | 7.70 (2.26) | 9.70 (2.16) | 8.604 (1,113) | 0.004* |
| First-order false belief | 4.46 (1.38) | 5.05 (1.24) | 2.308 (1,113) | 0.131 |
| Second-order false belief | 3.24 (1.59) | 4.65 (1.54) | 8.048 (1,113) | 0.005* |
The sociodemographic group difference in continuous variables was tested using the independent samples t test (t-statistic is reported), categorical variables with the chi-square test (χ2 is reported), and ToM scores with one-way analysis of covariance with intelligence quotient (IQ) as the covariate (F-statistic is reported).
FEP first-episode psychosis, HC healthy control, PANSS Positive and Negative Syndrome Scale.
*p < 0.01; **p < 0.001.