Risk factors and prediction nomogram model for psychosocial and behavioural problems among children and adolescents during the COVID-19 pandemic: A national multicentre study: Risk Factors of Childhood Psychosocial Problems

•The positive detection rate of psychological problems for children and adolescents living in Wuhan was greater than those outside Wuhan.•Parent-child conflict, sleep problems, online study time, physical activity time were identified as common risk factors within and outside Wuhan.•The prediction nomogram models constructed in this study have important clinical and public health implications.