Statistical analyses
A series of paired t-tests was carried out to compare whether there were any differences in mood (positive and negative affect), optimism, therapy motivation, and perceived stigma a) between baseline vs. after the assessment block of character strengths, b) baseline vs. after the assessment block of psychopathology, and c) between the two assessment blocks of character strengths vs. psychopathology. No alpha-level adjustments were made due to the exploratory nature and novelty of this study. If the assumptions for parametric paired t-tests were not met, the non-parametric Wilcoxon signed rank test was conducted. Non-parametric correlation analyses were carried out to check associations between psychotic symptom domains (frequency dimension) and character strengths. Qualitative data was evaluated descriptively.