Longer-term benefits have also been reported. For instance, in a randomized trial of Healthy Families Alaska in the United States, participants and controls were followed over a period of two years. At the end of this time, compared to children in the control group, more participating children scored in the normal range for problem behaviour, such as externalizing behaviour (e.g. over-activity, aggression, defiance: 82% for participants versus 77% for controls) and internalizing behaviour (e.g. inhibition, depression, withdrawal: 87% for participants versus 79% for controls)