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Digital media are becoming ubiquitous in children's lives; whether they displace important daily functions, such as sleep, physical activity, social interaction, and play, is a concern. Few studies have been conducted on media use and child development since newer forms of interactive and mobile media have become available. These investigators examined recent (2015–2017) data on 4520 children (age, 8–11 years) enrolled in a large study of adolescent development. They studied only the baseline data wave, including the children's screen time (using social media, watching television, etc.); sleep duration; and physical activity self-reported at the time that they completed standardized cognitive testing. Children were categorized by how well t…