Objectives: Psychotic-like experiences (PLEs) and problematic internet use (PIU) are common in adolescents. However, little is known about the association between PLEs and PIU among adolescents. The present study examined the associations between PLEs and PIU and negative life events among adolescents. Methods: In total, 1,678 adolescents attending high school were recruited for a cross-sectional survey. They completed self-reported assessments of PLEs using the Prodromal Questionnaire-16 (PQ-16) and measures of depression, anxiety, self-esteem, internet use, and negative life events using the Center for Epidemiological Studies Depression Scale (CES-D), the State-Trait Anxiety Inventory (STAI), the Rosenberg Self-Esteem Scale (RSES), the Korean Scale for Internet Addiction (K-scale), and the Lifetime Incidence of Traumatic Events for Children (LITE-C), including cybersexual harassment and school violence. Results: A total of 1,239 subjects (73.8%) scored at least 1 on the PQ-16. The mean total and distress PQ-16 scores were significantly higher in students who used mental health services. The total and distress prodromal questionnaire-16 (PQ-16) scores were positively correlated with the CES-D, STAI-S, STAI-T, LITE-C, and K-scale scores but negatively correlated with the RSES score. Hierarchical linear regression analysis revealed that PLEs were significantly associated with a high K-scale score and the incidence of negative life events, such as LITE-C, cybersexual harassment, and bully–victims. Conclusion: Our results demonstrate that PIU and negative life experiences were significantly associated with PLEs in adolescents. Assessment and therapeutic intervention with regard to internet use as a coping strategy for stress are needed to prevent the development of clinical psychotic symptoms.

Aim Breakfast plays an important role in the academic performance and mental health of adolescents. This study explored factors associated with breakfast skipping in high school students in South Korea. Methods A cross‐sectional survey was completed by 1684 high school students. A logistic regression analysis was conducted to determine the factors associated with skipping breakfast, including sociodemographic factors, mental health problems (such as depression and anxiety), sleep and smartphone use patterns. Results A total of 29.2% of the adolescents reported skipping breakfast and girls were significantly more likely to skip breakfast than boys (P < .001). The breakfast skipping group spent more time using a smartphone on weekdays [mean (SD) = 186.2 (180.0) min/d] than the breakfast eating group [mean (SD) = 110.2 (111.5) min/d] (P < .001). The Korean scale for smartphone addiction (S‐scale) score was higher in the breakfast skipping group (P = .006). Multivariate logistic regression analysis showed that female gender, poor academic performance (odds ratio (OR),  1.575; 95% CI,  1.166‐2.126, P = .003), depression (OR,  1.023; 95% CI,  1.002‐1.043, P = .031), time spent using a smartphone on weekdays (OR,  1.003; 95% CI,  1.002‐1.004, P < .001), and low parental monitoring of smartphone use were significantly associated with skipping breakfast. Conclusions Findings indicate that unhealthy lifestyle including smartphone overuse negatively affects breakfast eating in adolescents. School‐based nutritional programs should be designed to assess and overcome various individual factors associated with breakfast skipping.