In randomized clinical trials, children and adolescents improved their self care and reduced their emergency clinical utilization after playing health education and disease management video games. A diabetes game reduced diabetes-related urgent and emergency visits by 77 percent after diabetic youngsters had the game at home for six months, compared to no reduction in clinical utilization in a control group of diabetic youngsters who took home an entertainment video game that had no health content. Positive impacts were also found in clinical trials of games for asthma self-management and smoking prevention.