Past behavior is generally considered to be a good predictor of future behavior, but new research indicates that may not be the case in the development of depression, particularly among adolescent girls.
University of Washington social scientists tracked first- and second-graders for seven years and found that anti-social behavior among girls and anxiety among both sexes predicted depression in early adolescence. Surprisingly, early signs of depression were not predictive of adolescent depression.
"Anti-social behavior has typically been viewed as a big problem among boys, so it tends to be ignored among girls. Boys with early anti-social behavior typically go on to show more anti-social behavior while girls may turn inward with symptoms, morphing into other mental health problems such as depression eating disorders, anxiety and suicidal behavior during adolescence ," said James Mazza, a UW professor of educational psychology and lead author of the new study. He is currently serving as the past president of the American Association of Suicidology.
"When all the risk factors were analyzed, anti-social behavior and anxiety were the most predictive of later depression. It just may be that they are more prevalent in the early elementary school years than depression." He noted that depression and anxiety share a number of symptoms.
Mazza said that early adolescence is when the first episode of depression typically occurs and that's when it has been noted that gender difference occur, with more girls than boys experiencing depressive symptoms. Children can be assessed at 6 and 7 years of age, but depression is not often recognized or diagnosed until the middle school years.
Children in this study were drawn from a larger project looking at the risks for health and behavior problems. That project was conducted by the university's Social Development Research Group, with which Mazza is affiliated. More than 800 children participated in the depression study. Eighty-one percent were white and 54 percent were boys.