A study in Developmental Psychology done by researchers at Iowa State found that children with media such as TV and video games in the bedroom had increased total screen time weekly, and were more likely to be exposed to violence, and have a higher risk of poorer school performance, obesity, physically aggressive behavior and video game addiction compared with those without bedroom media access. The researchers remind parents that it is easier to not allow a television in the first place than to try to take it out. Although the study focused on television and video games, researchers believe the same or more results would be seen with smartphones and mobile devices.