The Role of After-school Exercise Services in Promoting Myopia and Physical and Mental Health in Children

Impact of voluntary participation in different types (e.g. outdoor physical activities, indoor physical activities, ball games, calisthenics, etc.), intensity and duration of after-school extended physical education services on children\'s myopia and other physical and psychological well-being

Students in the same grade as the exposure group but participating in after-school non-physical education extended services (e.g., homework help, static activities such as calligraphy, chess, etc.) served as a control group, aiming to maximise the control of the influence of potential factors other than physical activity on the results of the study.