Table 1.
Basic sample characteristics of the full sample
| Full sample | |
|---|---|
| (N = 1682)a | |
| Age (years), mean (SD) | 13.4 (1.47) |
| Gender, N (%) | |
| Male | 619 (37%) |
| Female | 1.053 (63%) |
| Other | 6 (0.4%) |
| Self-reported ethnicity, N (%)b | |
| Only Belgian | 1.183 (70%) |
| Moroccan | 146 (9%) |
| Turkish | 84 (5%) |
| Berbers | 65 (4%) |
| Italian | 42 (3%) |
| Polish | 21 (1%) |
| Kurdish | 16 (1%) |
| Other | 238 (14%) |
| Lifetime prevalence of at least one experience of childhood adversity, N (%) | |
| Conventional crimec | 512 (30%) |
| Indirect victimization | 783 (47%) |
| Child maltreatment | 596 (35%) |
| Peer or sibling victimization | 1,100 (65%) |
| Sexual victimization | 348 (21%) |
| Bullying prevalence | 707 (58%) |
| Cyber bullying prevalence | 367 (30%) |
| Physical bullying prevalence | 613 (50%) |
| Threat anticipation, mean (SD) | 10.24 (6.10) |
| Lifetime prevalence of prodromal symptoms, N (%)c | |
| At least one symptom | 464 (71%) |
| At least six symptoms (cutoff)d | 181 (28%) |
| General psychopathology, mean (SD) | 0.82 (0.59) |
aFull sample size was 1682, sample sizes varied over the different scales due to missing values
bIdentification as Belgian was assumed, children were asked to state all other nationalities they identify with, multiple answers were allowed on this scale, so that the number does not add up to the full sample of 1682 participants
cThis scale was not answered by participants in the first year (~ 12 years old)
dA cutoff score of ≥ 6 on the PQ-16 identifies people at ultra-high-risk for developing psychosis with a sensitivity and specificity of 87% each [40]