A 2015 study found that many US children were not drinking enough water. Scientists examined data from a group of 4,000 children, ages 6 to 19, between the years of 2009 and 2012. The data was taken from the National Health and Nutrition Survey, a study on the health of children in the United States conducted each year by the Centers for Disease Control and Prevention (CDC). The scientists found that more than half of the children who had participated in the survey were dehydrated, and nearly 25 percent reported drinking no plain water at all. Based on these results, the scientists involved in the study recommended that US children consume more water on a daily basis.