Post-Pandemic Mental Health of Children in School: Repeated Cross-Sectional SDQ Surveys in 2023 and 2025

Background: The COVID-19 pandemic has generated widespread concerns regarding its long-term effects on children’s mental health. While numerous studies documented increased psychological distress among children during the pandemic, less is known about how children’s emotional and behavioral functioning have evolved in the post-pandemic period. Objective: This study examines patterns of children’s mental health using survey data collected in 2023 and 2025. Guided by the dual-factor model of mental health, the analysis considers both psychological difficulties and positive social functioning in order to provide a multidimensional understanding of children’s well-being. Method: Data were collected using the Strengths and Difficulties Questionnaire (SDQ-25), a widely used behavioral screening instrument assessing emotional symptoms, conduct problems, hyperactivity/inattention, peer relationship problems, and prosocial behavior. These domains were analyzed across two time points to explore patterns of change in internalizing difficulties, externalizing difficulties, and social strengths among school-age children in the post-pandemic context (N = 1262 students in 2023 and N = 575 students in 2025). Results: The findings suggest that children’s mental health after the pandemic reflects both persistent vulnerability and adaptive capacity. Emotional symptoms and behavioral challenges remain present among a proportion of children, indicating that the psychological effects of pandemic-related disruptions may extend beyond the immediate crisis period. At the same time, many children demonstrate relatively stable levels of prosocial behavior, highlighting the continued importance of positive social functioning as a protective factor for psychological adjustment. Contributions: These results underscore the importance of adopting a comprehensive perspective on children’s mental health that recognizes both difficulties and strengths. The study highlights the role of schools and families in supporting children’s post-pandemic recovery through early mental health screening, social–emotional learning initiatives, and programs that promote empathy and peer support. Such approaches may contribute to strengthening children’s resilience and long-term well-being in the aftermath of large-scale social disruptions.