The National Institute of Health released a study in March, 2007 after following a group of children through early childhood to the 6th grade. The study found that the children who received a higher quality of childcare scored higher on 5th grade vocabulary tests than the children who had attended childcare of a lower quality. The study also reported that teachers found children from childcare to be "disobedient", fight more frequently, and more argumentative. The study reported the increases in both aggression and vocabulary were small. "The researchers emphasized that the children's behavior was within the normal range and were not considered clinically disordered."